Popular Mechanics 1921: Vol 36 Index

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Popular Mechanics Magazine INDEX TO VOL. XXXVI 1921 Edited by H. H. WINDSOR July to December Inclusive Popular Mechanics Company CHICAGO

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LR PT IT AL PE

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Wt ue ob aual, Index to Volume XXXVI, 1921 Abrams, Albert: Blood-Vibrations Determine Parentage... Accidents: — Falling, and Explosion Kills Airplane, Falling, Kills” og PEPE Eeee Airplane Tail-Spin Kills Girl Flier....... Coin, Falling, Disables Man.............. rr Acetylene and Oxygen Plant in the Klondike Acetylene Association Awards Medals...... Acetylene Tank, Roller Truck for.......... Acetylene Torch Cuts Holes in Veneer-Cut- a dk oo a a ak Goin i ieee wikia lke Aw ele’ Acetylene Valves Should Be Examined...... —_ Tank, Sulphuric, Has Special Construc- 2268S er a Acrobatic Stunts and Music Feature Toy. Aqeobate, Berlin, Do Thrilling Stunts ‘on Actinic-Ray Searchlight for Motion Pictures 2 — Recording Device for Study of Human ME ech ssensesesbesvesouecsss Adjuster, Cord, Made “from Spool sa ats Adjuster, Violin String, for Quick Changing Adventure Stories, Naval, Prizes for Advertisements: Pencil Sharpener for Pedestrians......... Poster Display Stand......cccccccccssces Scenes Lifelike, Window Display Cabinet PE \ickdhbta wat knee Veeco boa wena we Spark Plug, Huge, on ‘Auto TCR Cre Cree Turtles in Coke Office Window.......... Vacuum Cleaner, Mechanical Woman Op- Sr’ (Citta Gram with & ache bh 6. & Mids w dio bd bd wwala x Washing Machine, Window Display...... Advertising Rack, Illuminated............. Aerial Cableway for Island Campers....... Aerial, Loop, Concealed...........02e0eeeeee Aerial Mast, Wireless, Insulating a........ Aerial, Wireless, Uses Tesla Coupler........ Aerials, Wireless, Construction of.......... Aeronautics Affect Electric Fan Design, by 7 SE EE, Sin adds cub eseeescnedeevee Aeronautics: Aerial Bomb, World’s Largest, Makes a at arse WS econ aie ws Dew Aerial Competition, Long Distance Over- ae | UU eee ere —- Mail Service, Remarkable Record Aerial Mail, “The, by H. H. Windsor...... Aerial Navigation Compass, Deadbeat st kek bGA Ge Rea ee Ria ioe uw aan oe Air-Craft ant toes. S pmateged and Bal- loon, by Wm. H. Hunt.............s008 Airmen, Veteran, ¥ ~ =e Courses” for Airplane Aititude Record Attained with- i es ok dchks bee eeeme bas waoO Airplane, Anti-Infantry, See a eae Airplane, Armored, U. S. Latest Army. Airplane Bomb Explosion, Loose iting» IIS i v'n a's ak a od Scat’ Ut Ore Ae w moe ac Airplane Delivers Fish to Madrid, Spain. Airplane, Disabled, Parachute Lifts Pas- senger Cabin anemia capes erga pe aiageel Airplane Dives within Few Inches of TE er rrr re Airplane Duralumin is Subject to Crystal- SE waa's 4 ws cee SON wae kw ane ef Airplane, Dutch Passenger Monoplane Ce ee ype Airplane Engine, Powerful, Built by The OS DEER or reer ree Airplane Exploration Trip of Oil-Killed — egetation in Orinoco Delta........... Airplane Falls and Explosion Kills Five. . Airplane Field ae for Western sean ee pe. ie DOME L LCs Gib kekiewetéeberveewaeenes Airplane Hanger Door, Bascule-Type. Airplane, House Hunting by.............. Airplane, Hydro, is Tiny Trinket........ Airplane, Land Telegraph Cable Laid by. 846 Aeronautics: (Continued) Airplane Life Raft......cceeeeeeeeececces Airplane Mail Routes Except Transconti- nental to be Discontinued.............+-. Airplane Mail Service, China Adopts...... Airplane, New Type, to Try Coast-to-Coast TIOBOUE cc dvweconccecoeesceosssocresvesen Airplane Ornament on Auto Warns of CUOTUIOREIEE 6 cc ctnccccceessevecscasees Airplane Parachutes Rescue Flier Dropped i Ce TMG ve cctaceacsctenecesseues Airplane Photograph of “Smoking Moun- Ce” bck bee ds heehee rant eeew es eee ee Airplane Photographic Art, Masterpiece... Airplane, Pilotless, Wrecked by Plunge SR TOG ckccccsteevcescisercrctengavies Airplane Propeller, Draft from, Tests Pe sb acscddeee ec censeenenevws Airplane Propeller, Molded-Fabric, is Warp PE ccivesdas seeeeneatsiene® 8660008086 Airplane Race, Colleges Compete in...... Airplane Race, French, Speed Record Batebtished [ei cescavcscccesesvesesters Airplane Race, Pulitzer Trophy, Second PEED: gic ceee st bbhehk6t.6440 20a ewes28es Airplane, Racing, Strain from Speed WDE cocccecscececoescsscoeeresterses Airplane Riding Over Grand Canon....... Airplane Service Line for South African TE TRMORs oo cc cactccrceseecasesnss Airplane Sets Record for Fuel Economy.. Airplane, Small, to be Flivver of The Air — Speedster, Small, Makes Record Airplane Stunt Flier is Original and Dar- Airplene Stunt Flier Miraculously Escapes |) QPP PETETrTETrrrirrierrrreeeeee Airplane Tail-Spin Kills Girl Flier.... Airplane Taxi Trip, 4250 Mile, Made with- OE BAGARORE, ch ccc soecsecrvissvccenesss Airplane, Toy, Runs on Rope.......+.++.-. Airplane, Toy, Tire Tubes as Motor for. Airplane Trip to Summit of Mount Blanc. Airplane Trophy, Gorden Bennet, Replac ed by Coupe Deutsch.........-+seseeeeeeee Airplane Used to Combat Insect Pests. Airplane Wing-Load Indicator...........-. Airplane Wreck, Giant........-0-eeeseeee Airplanes, Commercial, Automatic Means OE CORGOE BOR indc cc ccc ovarccrocavecevess Airplanes, Effects of Air Currents Tested with, by E. H. Lemonon..........++-++.5 Airplanes Find Short Route from Cairo to Parr err eee Airplanes Launched from attleship by OO POO Tere rt Airplanes, U. S. Marine Corps, Make Rec- ord Tour of Cuba and Caribbean Sea Airplanes, War, Remodeled for Commercial PE nc cweretaccasdeieees en tewetoneiar Airplanes, Weather Bulletin for.......... Airplanes, Wind Tunnel for Testing...... Aviation Instruments, Bats Aid Develop- PEE Bscccctatrer pices tastesedecavsasds Balloon and Helicopter Combined, by Wm Farrer eerie ee Balloon Marriage by Wireless Telephone.. Balloon to Be Tested with Noninflammable I SE nding a eA 60 R550 6M w ke Ree eee se Balloon Trip Not Complete without a Slide Rule, by C. A. Briggs............ Balloon Victims, “ZR-2," Naval Honors for Balloon Wreckage, “ZR-2,” in Humber DOE 66d e400 8 60:00:60 5555004 2260 ReKOR ED Balloon—“ZR-2’s” Fatal Flight, by Phil a eM iad a Ges Sen doe, Sn dhs We Balloons, Naval Air-Service Ship for...... Blimp—Runaway Parachute Accident..... Dirigible “R-33" and Surrounding Land- SCANS PHROTOSPAPNS. .. 2. cc ccccccccscese — Victims, “ZR-2,” Naval Honors oe Wreckage, “ZR-2,” in Humber 2S ie rer rrr ee Dirigible—"“ZR-2’s” Fatal Flight, by Phil. _ — “ee a Ra eee mms eee > 407868 687 or ase

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Aeronautics: (Continued) Dirigibles, Giant, Mooring Masts for..... 7 Dirigibles, Nonrigid, Mooring Mast for.... 645 Flying Machine Wings, Rotary, by Henry i Eh iike haha kod ee keen eo aoe 15 Helicopter and Balloon Combined, by Wm. 56 Helicopter Demonstration, Prize for...... 799 Monoplane, Giant Passenger, French Firm ARP ner ee ea er - 550 Seaplane Aids Naval “Inspection Stata tahl ace 0 31 Seaplane, Anchored, Outrides Forty-Mile- an-Hour Gale............. eee. Seaplane Engine, Multiple Drive ieee scace Gow Seaplane for Land or Water.............. 804 Seaplane Housing, New-Type Shed for.... 333 Seaplane, Mono, Makes Fast Trip with errr re Tre 854 Seaplane—“NC-4" Crew Awarded Portu- Buese Decoration... ..cccccccccscccccese 812 Seaplanes, Naval Air- Service Ship for. 646 Seaplanes, New British, Have Wide Cruis- De Ds 66 nben sete eancnnetneetaase 587 Seaplanes Survey Venezuelana Oil Field... 224 Seaplanes Used for Social Purposes...... 519 Triplane, Diminutive, Flies Nimbly with re ee 187 Aggregates, Concrete, Size of............-. 611 Agricultural Implements, Drift “Testing _ WE BOG c ce acesesecencerxes ittegeanene exes SOT Agricultural Implements: Apple Rake, Mechanical.............. “se 356 Cotton Roller, Hand Operated... cick cin MA 362 Cultivator, Late Model, Works Two Rows 261 — Wagon Sideboards, Lever System . MT iviscadcc dears dd emasacacdersuheeeeos -- 114 Fertilizer Distributor. Homemade reper 125 Garden Rake, Sectional............... «+. 184 Garden Weeder, Homemade.............. 153 Grain Shocker Model..................00- 413 Grass Cutter, Bermuda, Renovates Lawn. 115 Harrow, Swivel Runner for........ execan ee Onion Set Cleaner............ atbadawe ve 466 Scraper Hitch, One-Man..............+6.- 726 Sprayer, Plant, Spravs under The Leaves. 297 Stump Puller, Simple........... iaaeeeese 636 Stump Removing Tool................e05 - 461 Tractor and Weed Exterminator..... scnaw Bee Tractor, Bull-Wheel Track Layer........ 699 Tractor, Endless-Tread. New Features of. 739 Tractor Greatly Simplified............... 744 —— Makes Rocky Valley into Useful as Tractor, Old, Attracts Attention at Show.. 680 SOE, TN . vc nek ecnntedee Deans nvens 31 Tractor Wheels Leveled for Hillside Culti- Sree rae 84 Agriculture—Oats, “— Species “of, Found in Sumas Prairie, Chatctstuseadodssnae 627 Agriculture—Well Duliling to Drain Land, ee as We WE RNS 6.05 Si acdedwswsccveccass 250 Air Compressing Outfit, “Compact a ar 910 Air Compressor Supply — onewe “for Small Motors........... “a 213 Air Compressors, Two * Four- ‘Stage, tor Bureau of Mines.........cecececsece 184 Air Currents, Effects of, "Tested with *Air- Plane, by E. BMUIGOE 6.8.05 56904 08045006 372 Air Device, Auxillary. for Gas Engines...... 631 Air Humidity, Uniform, Maintained with PE cacekerihecaeeueae cus daedsee -.. 692 Air, Liquid, Used to Expand “Bolts 5s a ae 46 Alarm, Bank Burglar, Works on oom Cir- DE + cin didseecsnaed es sas eeseecneveste6 06 392 Alarm Box, First Fire, in Boston.. at -- 109 Alarm, Burglar, New, Telephones Police. errs Alarm Circuit, Burglar........-2--eeeeeeeee 637 Alarm, Electric, Rings When Door Opens.. 682 Alarm, Flow Stoppage.........e.eeesseeees 777 Alarm, Spring-Operated, for Doors and Win- deusied)oshabeus a60 ame 64ae tpeatasane ae Alcohol as Motor Fuel ‘in ‘Hava 580 Alcohol, Wood Treated for, Yields Fifty Per Cent Increase..... 890 Alligator, ager 4 Captured ‘in ‘Indian Lake. - 247 Alloy, New, Adapted for Many U 692 Alloy, New Metallic, is wy Than Alumi- os CRS Ee ree Alloy, ‘Seit- Lubricating, for High * ‘Speed ED in 6 ohnn bs 0060040505068 58RR 5 ESOS 198 Alloy, Tin- - a * Removes Copper. ‘Deposit 2 PT. 6gchenbosceeeae Gena es tar ae se 88 Alloying Metals, ‘New Discovery on Action 934 Oe sckuseusvevenaes er tnheeepeansareeece POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Altitude Record, New Airplane.............. Aluminum Alloy Shield for Portable Lamp. . Aluminum Bronze, Amount of Thinner Re- I a ssnceccesseevnscasrece SS Te Ge oo: 6 6 obs 6 ots 050200260008 Aluminum Cooking Pan Fits Any Oven.... Aluminum Washing Machine............... Ammeter, Simple, How to Make a Ammunition—Bullet, New Expanding Amplifier and Detector, Combining......... Amplifier, Electric Sound, Uses Rigia Paper PE, cc avéevsneve stones as xa ebe 4a x ——, Sound, Augments Religious Serv- EE Rr ee he ee Amusement and Fishing Piers Side by Side. Amusement Park Figure, Giant, Attracts PE Ncdbgas oC bE Oiiew eee bh e aw ceaee & Anchoring Straps, Auto, for Shipping Angular Lines, Aid for Drawing............ Animal Fossil of Prehistoric has Found. Animal Fossils Found Along Red Deer PG, Manca abe benaer ee ekhbesence e Animal Speeds, Alberta Hunts Disclose. “Peer Animal Toy, Jointed.. Animals: eee eee Bee a kbc os ve ecccancecccees Cat Climbs Ladder to Bed on Ship........ Cat Taught to Strike Typewriter Keys.... Dog, Parachute, on Airplane with Master. Dogs, Russian, Pull Sleigh Over Ground.. Elephant Fossil, Giant, Found in Texas.. Goat, Nanny, Mothers prey Pups Goats Tramp Silage.. seeeee eee ewes Gopher, Tamed, Shows | Tunnel Building EE cui db +5 0040 Gobo es kan ee 4 oa eee ake Gopher Trap Kills Instantiv ae ee — Mountain, Killed Near ereeieees Lion’s Skull, Bone Structure of, by C. "A. are rrr ee eee are Monkey, Automobile Racing, on Saucer- Tj UR ae eeens Sheep, Trained, Does eee Tapir, Baby, and Mother.............+.e.. Woodchuck and Hawk Good Friends...... Announcer, Electric Roll, Names Stations.. - Killing, Poison and Honey Compound Antidazzle Stops Auto Headlicht Glare..... Antifebrile Drug, New, Found in India.... Antiseptics Prevent Wood Pulp Decay...... — for Shoes Makes Slippery Walks i Gaihwed «peas 0 ia bute eke Cnet hanks sake Ants Apnear to Be Caeetens Machines, by Ce Es inn sca taivandvaseeeasennesnsebae Ants, Strange Food Habits. of, by C. A. Ra rears ere rere re Anvil, New, Repairs Bent Auto Rims...... Apartment Hunting by Airplane........... Apple Rake. Mechanical, Picks up Apples. Apron and Mud Shield for Auto............ Aquaplaning Made Safe by Late Improve- RRR RS ee are ee ere ere Aquarium Made of Sea Shells.............. Arbor, Convenient Grinding...............-. Arbor, Improved Grinding ................. Arbor Press, Air Operated, Works with One a rE RRA eee eee Arc Lamp, Low-Voltage ............eeeee0% Are Rheostat, Electric Iron as........ eae Arch, Centennial, in Ottawa.......... ea Arch, ws Proposed for Merced, Cali- fornia Said Sa ce se wh aa So clea lin Arch Support, Steel Ridged, Built in Shoe. Architect Bureau for Small Home Builders Armature Winding Machine, Rapid........ Armchair, Aquatic, for Bathers............. Armchair, Collapsible, for Tourists......... Armless Autoist Drives Automobile........ Armlet, Feathered, 's Parisian Conception.. Army Airplane, Armored..............e.6+4. Army Motor Vehicles Housed in Museum... Army Semaphore Code Taught by Cardboard ll a ee, eer we we ee eee Army-—Smoke_ Screen White, Replaces BEE ocncdeadsedaaheeenne ebb hiedeces tos Art Building, New, Planned for Amsterdam Art Institute Students Model Fountain.... Art, National Gallery of, Smithsonian Insti- tution to Promote ........0- cece cece eenee Asbestos as Protection for Auto Hoods.... Asbestos Building Material, Good Properties of ee ee ee ee ee ee 800 319 958 735 sn a a Prey ate « an a a ai A >> > ah & & & & BS HPP ~~.

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enable A TRA i sh ih ACTED. Airs 3 i> PR al nc a a A a ti ane’ mE, 5 CRM SPE HOO POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Asbestos Paper as Packing Material for An- nealing Steel DieS...........-eeeeeeeeeeee 292 Ash Chute from Stove to Basement........ 793 Ash Sifter, Furnace Grate...........+..4+- 761 Ash Tray, Automobile, Hooks on Uphols- Asphalt Filler from Slate Waste........... 534 Asphalt Shingles, Tapered................. 678 Asphaltum Varnish Preserves Screens...... 307 Assembly Hall Incline for Wheel Chair Pa- SERED gc cdcdcesrceccderecesnsceeoeeseseses 882 Astronomical Observatory, German, to Test Einstein Theory Astronomy—Earth May Leave The Sun, by CS, A, TRPAGEB s ccccccccccvcscccrecccccsccess 122 Astronomy—Stars Appear as Points of Light in The Largest Telescopes, by C. A. Briggs 442 Astronomy—Venus, Planet, Photographed in DAVE ccc ccccccsccccccccccsencccnevess 4 Atom Apparatus Will Demonstrate Modern TROGET cccccccsecesesecececvescvcecseses 754 Atomizer for Bathing Birds................ 798 Audion-Bulb Fuse for Wireless............ 35 Audion Receiver, Short-Wave Regenera- SE ebb dS 65.65 aH SEANO SS RO ROC ED ER OO ROD ORS 788 Auditorium and Gymnasium Combined in EE. Fad bona d525666E S44 pod ODC Reece ORE HSS 14 Auger Worm, Broken, Replacing........... 768 Automobile Airplane Ornament Warns of Overheating 7 Automoblle Anchoring Straps for Shipping. 435 Automobile Apron and Mud Shield......... 784 Automobile, Armless Autoist Drives........ 18 Automobile as Farm Power Plant.......... 785 Automobile Ash Tray Hooks on Upholstery 368 Automobile Baby Bag Makes Child Safe.... 752 Automobile Baby Crib.............22ee0055 592 Automobile Baby Crib, Folding............ 708 Automobile Baby Crib for Touring......... 272 Automobile Batteries, Connecting Lugs for 692 Automobile Battery Charged by Light Cir- cuit Device A Se re pr eee 79 Automobile Boat for Land or Water....... 809 Automobile Body Has Complete Camping PE PkOAshesCeweesheebedhie ade eeeoe sees 676 Automobile Body is "Huge Spark Plug...... 210 Automobile Brakes, Squealing, Compound PEE Gi cd dune sensienesanacanstessaaee 924 Aqeaeaes Bumper Convertible into Tow ar Automobile Bungalow is Official’s Quarters 391 Automobile Bus, Hotel, Luxury and Com- St cecechuevhebatedbidedvsee cee 837 Automobile, Camp, with Launch Top Automobile Canteen is Well-Laid Dinner Table Er eon = WH Automobile Caravan Warmly Greeted SeRCSRLU GES) cade eke as 6% 40.050 O05 400s 893 Automobile Carburetor Heating Device..... 557 Automobile, Childs Leg Power, Resembles Ee eee wnt dektben sees keenea tees 104 Automobile scontees Instruments on Steer- . 2. erasers 613 Automobile Controlled by Wireless........ 526 Automobile Crank Used for Backing Car.. 794 Automobile, “Cross Country Locomotive”. 849 Automobile Cylinders, Roundness Testing Device for Automobile Dash Thermometer Eliminates rene of Automobile, Diminutive, for Land or Water 681 Automobile Drive, Inclined, Depressions Stop Backing on aes e Drivers, Careless, Cards Mailed ERENCES C kee eae ose eCNeREe ses 0enee 6 38 Automobile Drivers, Heel Plate for........ 433 Automobile Drives Saw................0008 626 Automobile Driving Out of a Rut.......... 796 Automobile Engine Cleaning Device........ 294 Automobile Engine Crankcase, Radiating PL. 5 pcneatescesentideesanseees 277 Automobile Engine Intake Pipe Fitment Saves Gas 2 Automobile Engine Made More Efficient by Cooling System Pump............00250008 384 Automobile Engine Thermostat Saves Gas- PTS caus chenheeeanad hen enh ebeees oes 00 26 Automobile Exhaust Cooking Utensils..... 820 edie Exhaust Heats Water for Tour- me aes & ee“ eaeeeeey Fire Chief's Wireless Telephone ose Automobile Flywheel Ring Gear, Change- see Amomebiie Fuel, Havana Uses Alcohol as. 580 Automobile Fuel Lines, Cleaning.......... 765 Automobile Gases in Tunnel Create Prob- lem, by John Anson Ford.........+.ss06.5 393 Angememite Gear Shift Located on Steering ane WD .nb'4a- 0s 6000005640500 0050606 00040408 Automobile Greasing, Inclined Runways for 73 Automobile Has Eighty Gallon Whiskey Dt. ScsQeeebbenbedsniGkese ons 6 00neeeen 578 Automobile Has Sliding Roof.............. 529 Automobile Headlight Lens Washer, Substi- CS GE bdo cncacasettseroscceserscoscecee 791 Automobile Headlight Wires, Protecting... 951 — Headlights, Antidazzle Device ses Automobile Heater, Electric, Also Heats 188 Automobile Hitching Posts................. 428 Automobile Hood, Asbestos Protects....... 958 Automobile Hood Held Open by Spring.... 534 Automobile, House on, Has Modern Improve- REE seh deceeedsceuewse nes 44004505 0086004 337 Automobile Interior, Dust Cover Protects... 747 Automobile Jack, Emergency.............. 792 Automobile Jack, Tire Changing........... 266 Automobile Jitney Busses for Kansas City. 67 Automobile Jump is Movie Thriller........ 176 RESIST, SUMTER on nccesciccccccsieccese 54 Automobile. King’s, Becomes Sight-Seeing REARS ATE se oa 47 Aqsa Laundry Washes and Polishes 5 CE CGPRURBREE DOES ESO OHNE NES 409846 ede 0 58 Automobile Lights, Safety Switch for, Mounted on Steering Arm............. 378 meee “eves Limousine Built on Truck Chas- ° D. ShbSKOS SD O6h ER OOD ES OOS be e008 004060 d 691 Automobile Loads, Overhead Gangplank for Viewi ing Lietehteeteeinaseksh eb eews dee os 48 Automobile, Low Priced, Converted into 14 Seated Coach asm hia ai or Ole le OOO mk ahiale 367 Automobile, Manchurian Governor’s, is Steel- Walled Fort, my SOO. We POEs ccccccecese 398 Automobile, Miniature’ (ih ecasietevanes oun. 828 Antomobile’ Motor Bus, Detroit, Design In- PP SEE dncsnddoesecpaceacteseaeses 415 SaSpeeas Motor Truck Fleet, Photograph ASO AENES OLED OODE OE EROOS 6040 046600646008 6 425 Automebthe Mudguard Dents, Removing. . 6256 — New Light, Has Desirable Fea- 993 i th2eecdtieateeiseadwteaberss son ae ues Automobile Oil Gauge Signals Shortage.... 896 Automobile Operates Merry-Go-Round...... 863 Automobile “Park All Day” Signs in Safety DO Kivcccninesrbadde deudeenes daa takeioe 28 Automobile Parked Near Table in Open-Air De cfitawsd eebhgnweso’eeaG eeadeee 533 Automobile Parking Garage Has Elevators Se SI vacadacnennesccedcctscseaze 751 Automobile Parking Lamp................. 953 Automobile Parts, Stand for Washing...... 613 Automobile Pedals, Bent, a Convenience.... 790 a Piston Rings Clamped for Turn- Oe bce ces kesaneeenet ee se ue dans seebons se 140 Automobile Platform for Movie Camera. 711 Automobile Postal Service in Finnish Lap- Dt tceeckwhdbew stan bukne soe 6e0benawsees 18 Automobile Racing Monkey on Saucer- EEE, cu deen nadees00o000s% sese060 441 Automobile Radiator Funnel............... 782 Automobile Radiator Valve Prevents Freez- D> Rtskens Ces eeibtatesdceahbecdeas wahiea® 353 Automobile Radiators Made of Tubular PE DED. wees awicbwinsaessedeecesene 8k Automobile Radiators, Quick Detachable... 111 Automobile Radiators, Testing............. 131 Automobile Rear Deck, Extension of....... 83 Automobile, Rear, Gauging Distances of.... 291 Automobile Repair Insurance, Garage Gives 894 Automobile Rim Lug, Improved............ 90 Automobile Runway, Small, for Curbs...... $36 Automobile Safeguarded by Wireless Tele- BTAPN ..nccccrcccccccccsecsesccssessscsess 723 Automobile School Trains Ex-Service Men. 258 Automobile Seat Pads, Cleanable........... 265 Automobile Seat, Reversible........-...++.. 630 Automobile Sense, Getting, by H. H. WINEBOP 2. cccccccccccccccscccscsccsccvers 348 Automobile Shoestore, Traveling..........- 364 Automobile Sign for Pleasure and Business

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6 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Automobile Sign Post and Directory Com- bined Automobile Signal is Parking Mirror Y Automobile Signal, Telescoping........ sees Automobile Signal Uses Incandescent Neon ee ere eenee eee e ee resespeeessreseesreseseseeseeeseses Gas Automobile Sleigh Runners, Making........ Automobile Sleigh Used in Canada........ Automobile, Small Electric........-+-.++-++:- Automobile, Small, Resembles Motorcycle with Sidecar .......-- ck aloe 2 eR ne Automobile Spark Plugs, Faulty, Antishock Ignition Tester for........ Automobile Speed Controller........-+++--- Automobile Spotlight, Bellow-Front, Enclosed Cars .....-+eeeeseeeeereressesss Automobile Spotlight Controlled from Inside BGI . access a CG esesCReteesensvesoceses Automobile Springs, Lubricating....... or Automobile Starting Made Easy with Elec- tric Vaporizer Automobile Starting with Shorter Ignition. Automobile Steering-Wheel Handle ........ Automobile Table, Convenient..........--- Automobile Teaching Simplified with Mov- ing Pictures Antennae Tire Carrier is Quick Demount- ing Tool Automobile Automobile Tire Chains, Care of Automobile Tire Gauge Tells Pressure While Inflating Automobile Automobile Tire Pump, ee ee ee ecoeceeeeeeesrereeseee eee ener eee eeeeeeesreeesesteseeeeeese Cece eeseeeSSeSeSeeeseeseeeseeeseseoeos es eeceececescesr eres eereseeeeeeeseseese Wee PRIME. cc ccc cence aeccecesece SEPP ECT TCT Cer Automobile Tires Punctured by New Weed OT rere ree ry er ee tt Automobile Tires, Sectional Casings Save.. Automobile Tires, Umbrellalike Shade for. Automobile Toilet Set Installed in Door of seer ye tree Automobile Tool Box, Ornamental.......... Automobile Tool, Key Ring........ Tere Automobile Top, Streamlined, Built Like eee eer ere eer eeeeeteseseeese Airplane Wing Automobile Tourists, Canadian Route to Pacific Coast Now Open to..........+++6:. Automobile Tourists Given Welcome by Minmneapolia .....ccccscccccccccccccccesces Automobile Tourists, Screen Baby Hammock SOS SHSECSSSSHHSSESHSSOSOSSSSOESEHLEOSSCHEEEOEO®E tion is Automobile Truck Axles, Three Point Sus- pension Automobile Truck Crane Boom Has Full Circle SwWeeP ..ccccccccsses ARES ER, Pra Automobile Truck for Detroit Garbage.... Automobile Truck Freight Rates, Nebraska RODORIS 2. cccccsce PPTL ET ret ee eee Automobile Truck is Church on Wheels.... Automobile Truck, Producer Gas on, Re- ee err ee Automobile Truck, Steam................+:. Automobile Truck Stuck in The Mud, Method eT Perr re eee eee Automobile Truck Tires, Pneumatic, Resil- ent Wheels Displace.............ee.2200. Automobile Vacuum Tank, Gasoline Filter Frere are ° Automobile Valves Accurately Ground by New Device Automobile Ventilation, Screen Door Hooks ra ai cai aaa ie os eat elak ah cle ste Wi ah a abe Aa ae Automobile, Walking Automobile Washing, Sponge Nozzle for.... Automobile Wheel, Pneumatic Tire Inside of Automobile White Plague Clinic........... Automobile Windshield Cleaner is Electri- cally Heated Automobile Windshield Draining Protector. Automobile Windshield Glare Removed with Sprime Roller Sunshade...............2-5. ee ee ee ee ‘Automobile Wireless Receiving Set........ Automobile Wireless, West Coast, Catches Aatetthe Wrecked, ia’ Railrosd-Grossing Mais Weedibad’ Seeds tet dbaies feabemebiten inkared. taterapeis #iret-did BT EE EEE Eh ppaenenee Automobiles “Now Ferried over Lake Pont- @hartraini :............ 00 eeee Distadeacues Automobiles, One Piece Steel Wheels for... Automobiles, Small, Truck for Unloading.. Automobiles, Turbine Washing Brushes for 400 Automobiles, Wood Bumpers for........... 236 Awning for Galvanizing Kettles........... 297 Awning, Pneumatic, Transforms Lawn into Theater, by Henry S. White............. 351 Awnings, Store, Protecting............... -. 612 Axle Housing Used as Grinder Column..... 291 Axle Suspension for Industrial Trucks Im- proved ......... ‘ween ee SSdewesAaeeenawane 203 Axles, Truck, Three-Point Suspension for.. 208 Babbitt and Wiping Solder, Heating....... 125 Babies, Hospital, Identified by Bead Neck- Psa iguueduewdea aman we ae @ iin shia ce ak 98 Babies of Immigrant Mothers Begin Life ET crake Gs wa behee nlee >be ean me 86 Babies’ Teeth Sometimes Slow but Always mere, BY C. A. TAPS. «occ cccccvncesccess 122 Baby, Bag for, Holds Child in Auto....... 752 Baby Carriage Has Extra Seat for Next WEEE. Sh eaceieapesakudicnnde aos aches ee 593 Baby Carriage, Wireless Megaphone for.... 22 Baby Crib, Collapsible, for Auto Touring.. 272 Baby Crib, Folding, for Auto.............. 708 Baby Crib for Motor Car..............e.00- 592 Baby Hammock, Screen, for Auto Tourists.. 706 Baby Incubator Heated by Electricity..... 356 Baby Jumper, Gocart, and High Chair in BUR een ic bach Win nes ae be we Sc ph ate 920 Baby Sanitarium, Open-Air, Accommodates ee he Pe eee Teer Tee eee Backrest, Adjustable .............cccceeee - 642 Bacteria Preserving, by A. C. Briggs....... - 602 Bag, Baby, Holds Child in Auto........... 752 Bag for Protecting Lamp Shades While RES REE eee Pot ari a 113 Bag, Golf, and Valise in One.............. 164 Bag, Paper Shopping. .....cccccccccccccece 592 Bag, Reinforced Collapsible, for Shipping.. 35 SO ES. ree ene 273 Bag, Silk, Bouquet Preserved in........... 96 Bag, Silk, Made from Sow’s Ear........... 712 Bag Tying by Electric Machine............ 349 Baggage Truck, Lawn Mower as........... 795 Bagging Needle Made from Can Opener.... 636 Bags, Cement and Lime, Made of Special NS. Soci kk uch ncn aaah oa os ene Scala ew we 227 Baking Soda Whips Stubborn Fire......... 412 Ball Bearing Bushings Show Less Tractive NN sd cicanais ated dice didn bin wie dina ak aes 437 Ball Pitching Cannon Tests Players Skill.. 346 Ballast, Live, for Yacht................... 317 Balloon and Helicopter Combined in Air Comet, De Wik. TE. ROME... ccc ccccccsccsas 255 Balloon, Canoes Made from, by Canadian xia Bie Sk kG a he diet ds Beh ata Se 542 Balloon Marriage by Wireless Telephone... 396 Balloon to Be Tested with Noninflammable 2 RM gpegaeinne ige Rete se 822 Balloon Trip Not Complete without a Slide memhe, By CS. A. TERS, occ ccwcrccsvcioic 762 Balloon Victims, “ZR-2,"” Naval Honors for. 663 Balloon Wreckage, “ZR-2,” in Humber SN en din ead ewie ashi @ Mika Meat ow arnold ong kas ao 662 Balloon—"ZR-2’s” Fatal Flight, by Phil W. NY & itn wines wake ai eth aghiniah wae oasis da ba 499 Balloons, Naval Air-Service Ship for........ 646 Balloons, Nonrigid, Mooring Mast for....... 645 Balloons, Toy, Vender Has Long Mass of.. 600 Ballots, Election, Counted with Tabulating EY -cd:nne Weinmh te Rw eee ded Maldesx occas ee esi 82 Balls, Refinishing Golf .................... 786 Reem, TORMEE, DOMMIOOE., 2 oc nae ccincccccacccce 285 Balusters, Porch, Duplicated in Lathe...... 291 Bamboo Reinforcement for Concrete Piles. 511 Banana Stems, Uses for................005, 936 Banding Wheel, Phonograph As............ 793 —. Compact, Built Mechanically Per- rer tp RRR AES AC Se +8 ees ee 164 Bandsaw for Logging, Handy.............. 123 Bandstand, Concrete, for New Orleans Park 588 a peepee Concrete, is World-War Memo- _. a arr eee 749 Bandstand, Portable, Moved on Truck...... 511 Banjo, Metal, for Rough Usage............ 482 Bank, Bedstead Savings..............0.e00- 477 Bank Building, Federal Reserve, in Kansas MN . cceUsctseesa Rabe aade SEh eG ees das oan 917 Bank Building Sign, Large, Contractors’ Ai ee era 670 Bank Burglar Alarm Works on Open Circuit 392 Bank, Canadian, for Fort Smith............ 581 ee eee ins e aplti* SO Cr Nl ED Be iota Sy Sow ne le

Page 7

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Bank Corner Stone, Gold Trowel Lays Mor- Oe Oe in oo nnn 00 040500605 60000600060005008 74 ~ Messengers, Alarm- Lia Money Carry- ME CaS FOF... .cccceccccscescceses iis ten 704 mn. Teller’s a ae 688 Bar Bending Machine, Power Driven....... 882 Bar, Pinch, Made Safe to Handle........... 619 Bar Stock, Short, Sawing.................+- 938 Bar, Tow, Auto Bumper Convertible into.. 351 Barbed Wire as Concrete Reinforcing...... 451 Barber Chair, Children’s, Seat and Horse _ ED, ig .05648n0eseeedeeees epnsewasest 252 Barge, Fresh Water, Sugar Refinery Em- DIOVS cccccccccccccsccvccess een de ewes 825 parse, Seagoing, Painting @.........-.4+6-- 230 Barge, Self-Propelled, for Mexican Oil A CE fe ee dee oe weet een eier eben eek ae 525 Bark Decorations on Czecho- “Slovak Cars.. 875 Barrel Fluids, ‘Drawing Viscous, in Cold WeOtRO? .cccccccccccccsvscseces tee caeaae 937 WR TEE 6 vcctcccacdseccaccsonsecevase 314 Barrel, Improvised Tumbling.............. 925 Barrel, Measuring Liquid in................ 951 Barrel, Steel, Tumbler Made from.......... 292 Barrel Water Heated with Blowtorch...... 934 Barrels, Cider, Kept Air Tight............. 468 Barrels, Detachable Handles for............ 946 Barrier, Fiexible, for Railroad Crossings... 831 Bars, Welding Short, Proves Profitable.. 596 Bars, Window, Prevent Accidents.......... 342 Basalt Used as New Kind of Insulation... 52 Bascule Bridge, Steel, for New Orleans Lock ht ere are eter tr 173 Baseball Champion Series Reported Over Greatest Single Unbroken Telegraph Cir- Pi cht bivoed aka ehChene edhe bee de ket e-eme 853 Baseball Mask, Sheet-Metal................ 368 Baseball Pitching Machine................. 346 Baseball Pitching Machine, Compressed Air, ws.” £2 Peer eee 703 Baseball Scores, World’s Series, Reported to Fans in Hospital...........cc.eee.ceee 832 Baseball Umpire Uses Cage.........-0..0055 334 Basket Cart for Carrying Provisions ieee 112 Basket, Flower, Made from Steel Trench OR arr cr rere 151 Basket for Carrying Child While Shopping. 433 Basketball Scores, Bell Signal Announces... 276 Baskets, Wire Waste, Protect Light Globes 797 Bath, Shower, in Trunk for Travelers...... 168 Bathers, Armchair for.........0--eeeeeeeees 308 Bathing Beach Water, Chlorine Purifies... 651 7 Facilities, Unusual, of San Diego one Cece e ees eeeeseeeeresreseseeseeseeesesese vo Bathing: Frolic, Submerging Boat for...... 355 Bathing, Pneumatic Water Wings for...... 112 FORCE TOTES onc ccc ces teeta cseccncecss 340 Bathroom Wall, Electric Heater Fits in.... 914 Baths, Bird, Helmets Used as............-. 955 eS OS OS rere rrr rere 633 Bathtub Dolls, Rubber, for Children....... 440 Bathtub Filter, Charcoal.................-- 755 Bathtub, Safety Rubber Mat for........... 433 Bats Aid Development of Aviation Instru- DE GR CLEGG. cLoeabarek bates bseeseescese SES Batteries, Connecting Lug for............. 692 Batteries, Dry, Protecting.............++++. 632 Batteries, Dry, Spring Connector for....... 126 Batteries, Storage, on Mine Locomotives PE cnr tubes e eked ws bc egeaeeheeeese cee et 7 Batteries, Storage, Sealing Cracks in....... 928 Battery, Auto, Charged by Light Circuit PE chee ncebpedeudesssdde6es0 RR a ee ERS 579 Battery Meter Tests Battery Three ‘Ways 382 Battery Plate Separators, Tool for Inserting 271 Battery Terminals, Repairing Loose........ 630 Battery Terminals, Storage, Corroded, Re- moving Cables from........----+-ee2eeeee 477 Battery, Thin Plate Storage, Electrical Out- Le er eee rs Sie ree re 704 Battlefields’ to Be Marked by Relief Maps. 578 Battleship “Alabama,” Bombing Tests on.. 869 Battleship Catapult for Launching Air- ES re err rer rer 842 Battleship, Crewless, Operated by Radio, by Ss. ES eV kid ano hah we we as ee 166 Battleship “New Mexico” Wins Efficiency Dt Ktreikhshsthbtacarcddeedhaedeareheane® 493 Battleship “Tennessee,” Reversing Test of.. 278 Battleship Torpedoes Fired oom Triple EE SAG di Rea h see One he 6anndeesee ee Ene 204 Battleship “Washington” Soon to Be Launched ........ = ee pene eacacnee 544 Beach Amusements ...........eceeceeesee+ 340 Beach Sandals for Bathers....... sea eo br te Nac 393 7 Bead Reformer, Tire Rim. ....cccccccccvcce 688 Beading Tool for Sheet Metal.............. 619 Beads, Hospital Babies Identified by........ 98 Bear on Stump is Trophy to Marine Corps. 909 ee Tee. GR Es c wocceresssacénee 280 Bearing Bushing Oil-Grooving Machine.... 881 Bearing Rings, Pliers for........sccceccecs 778 Bearing Scrapers, Piston Ring............. 445 Bearings, Babbitt, Oil Grooves in........... 780 Bearings, Babbitt, Reamer for............. 771 ORE, CURR BGs ks cc csccdccsosseence 933 Bearings, Faulty, Detected with Stetho- : Rnena ce Mena ehee he henna 572, 591 Bearings, High Speed Self-Lubricating BE. SO ict cnsdedadewetancseenesnans cen 98 Bearings, Huge Roller, for Immense Hangar FTP rr Tre TTTT ere LTT Tree 854 Bearings, Improved Journal, for Railroad SE attdeckw ede so0006690 0054000005 0058 08 756 DGRTINEG, Gli GOUMS FOP sc ccccscccceccevcece 936 Bearings, Roller, Spacer Ring for........... 435 Bearings, Shaft, Inexpensive........... 139 Bearings, saree stetigie Roller, for Railroad SC cistatseneeceadebe teehee bedee shee 2 Bed, Convertible, “for Jury MOOG: cccccsees 758 Bed—Cots, Three, Made from Two.......... 311 Bed, Hammock, Can Be Folded into Size of ee Me Séawasswenes Ceceveveceeeeseceer 437 ROGRCORE BRVIRS WOO occ ccccccssccccscces 477 Beet Sugar, Manufacture of, in England... 390 Beetle Pest, Pine-Bark, Destroyed by Elec- Ge. a scecducenceended cease cuter tunwaes 68 Beets, Sugar, Automatic Cleaner and Loader 5 for, by Frank B. Howe Bell, Church, Master Clock Rings.......... 759 Bell Contacts, Eliminating Sparks on...... 146 Bell, Door, Gives Two Distinct Signals.... 474 Bell, Electric, Rings When Door Opeps..... 682 Bell Signal Announces Basketball Scores.. 276 Belt Adjustment, Inside, Sustains Trousers. 592 Belt, Fan, Breaking, Stops Engine........ 134 elt Joint PG thaccawes anes Wircnueeeson 2 Belt, Rubber Canvas, as Conveyor for Red- DC Eo. ce oeee es ci gaseecessases 239 Bees Oe, BUM kc cece cicceveccncces 777 Belt Unrolling Device for Small Floor Space 389 Belting Cutter Has Transverse Motion..... 352 Bench Lathe, Six-Inch, Making a.......... 607 Omen Dee TOP CMG. .cccccccicccvscces 774 Bench Stop, Self-Adjusting................. 285 Bench, Test, for Auto and Electrical De- EL ca bck ew Re a a as ie de ee wee acne 675, 718 Benches, Railroad Station, Illuminated..... 108 Bending Machine, Power Driven........... 882 SO ee, Se oo vohusess se beeeeeees 417 Berry Picker is Simple Invention.......... 519 Berth Hung on Pivots Prevents Seasickness 202 Berth Ventilation, Extra, in Sleeper........ 935 EY SE 6 GUE Sid dite ba Keb 6 6 00006 0% ob 0 341 Bicycle Drives Horse Clipper............... 290 eee, WOE BINS OR sos stews ccccocccecnsece 364 Bicycle Has Front Wheel Drive Engine.... 32 Bicycle Horn, Homemade...........escse00. 304 ee Cee I cco ebbbeéeeeyeeeee 437 Bicycle Motor, French, is Smallest Made.... 644 Bicycle Rack, Rustic, is Park Convenience. 114 Bicycle Reflector, Simple............ccecees 792 Bicycle Sidecar for Bundles................ 848 Bilge Pump for Launch Electrically Oper- i Witbi uh wine e Sab ohne oa enen eo bees 420 Binders, Loose Leaf, Card Fastening in.... 777 th PE oo aah anewew bees ene oe 615. Bird Baths, Helmets Used as............... 955. EO eee 633 Bird—Hawk and Woodchuck Good Friends $21 Bird, Squirrel, and Bulldog are Fast Dt .+ loss piece awhRGs beatae Neha bows. e's 251 Birdcage, Largest, Huge Steel Dome is.... 352 Birdhouses, Helmets Used as............... 956 Birdhouses Mounted on Poplar Trees...... 682 Birdhouses of St. Thomas, Canada........ 589 Birds, Banded, Should Be Reported......... 578 ee, SE, EE oc diccnccesocseceeeses 798 Birds—Pheasant Farm Operated by Convicts, by Lawrence William Pedrose........... 547 Birds—Sparrows, Nest-Box ee COP. cscaes 306 Bismuth Wire Manufactured in United Dt? itentt Si eb iGa wks suas wade eeetenseas 236 Bit, Broken, Replacing Worm of........... 768 Bit, Soldering, Adjustable...............66. 453 eee, TONE, TOOUMONEOP BOR. ccc ccccccccccess 932 Blackberry, Giant, Discovered in South Pe Ck latin hdbeneiae ieee ak wae oew ee 223 Blackboard, Elevator, College Laboratory... 342 Blackboard, Parallel Ruler for...........++. 779

Page 8

8 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Blades, Ship Propeller, Grinder with Flex- ible Shaft Grinds Blades, Veneer Cutter, Cn DRvs wen ceseck bates secs esneens Blanking Pressure Calculating Instrument. Blasting Scenic Mountain Road from Cliffs, by Frederic Kinney Blasting Snow from Road Over Mount DE: cig eutaewaeehne sede et hed crvetends Blimp—-Runaway Parachute Accident Blind Holes, Transferring Blind, Push Wheel Arrangement Aids...... d “Block-Ball”. Puzzle ....cccccccscccccccecs Block “V,” Adjustable é BO, “0.” TOGGE PHONG cc vc ccccceccccvcivess Block, “V,” Improved........--. eseeseccces Blocks, Cast Iron, for Road Paving........ Blocks, Large Wooden, for Lawn Dice..... Blood Vibrations Determine Parentage, Albert ADFAME ..cccccccccccccscccscccces Blower Protects Citrus Orchards from Frost Blow-Out Boot for Tires.........-...-..++- Blowpipe, Oxyacetylene, Lit Under Water.. Blowtorch Cleans Typewriter.............. Blowtorch, Heating Water with............ Blowtorches Convert Cactus into Fodder... Blue Sunday “Reformers” Working, by H. i, MEU nba band cdSsBadaremres csdecess Boards, Building, Made from Sugar Mill Waste, by Thos. Ewing Dabney.......... Boat, Animal, in Water Carnival........... Boat, Automobile, for Land or Water...681, ee Self-Propelled, for Mexican Oil ME Sb .cbs cd DeSAned ones Khe een 6 00 OE ewes at Gere. “Alabama,” Bombing Tests Puzzle Boat—Battleship Catapult for Launching ERE errr rer Boat—Battleship “New Mexico” Wins Effi- i CE 66 pentane nes eee cureie hued a " seed “Tennessee,” Reversing Tes of Boat—Battieship Washington” veces eetided OPOOS Oe 608 eel Ome Boat, Bicycle . 6. cccccccccccccccccccccccces Boat “Campania,” Blowing Up............. Boat Can Adjust its Stern Paddie Wheel. Boat—Canoe Covers 8,000 Miles............ Boat—Crewless_ Battleship Operated Radio, by S. R. Winters.......-...--2++6- Boat—Destroyer “Israel-98,” Mine Laying.. Boat—Destroyer Torpedoes Fired from Tri- WED TDD oc 0:0:0.6:5.0:0 00086008 sesareeseseses Boat—Destroyer “Wickes” Won First Hon- ors for Efficiency of Operation and “Zel- ED esc cgadettes eed beaeneeenene + Boat, Double Deck Life, Carries Seventy... Boat—Dredge, Immense Suction, Sinks Boat—Flagship Policy, New, U. S. Navy PEE <screterkcanedetostsheveieencewe see. Boat, French, for Land or Water...........- Boat, Fresh Water, Sugar Refinery Employs Boat Has Knockdown Stalls for Transport- ing Mules to Hawaii.............eeeeee5- Boat Hulls, Copper-Covered, Not Impervious to DE . sch. e:0e6G49-ke ae U0 a ams ok eae ee Boat—Hydro-Glider for Ocean Joy Riders.. Boat, Ice, Building An—Part I, Hull Con- struction ......... Boat, Ice Channel Boat, Jazz, is Merry-Go-Round on Water. — Camp, Convertible into Auto ee ee ee ee ee Boat " taatinn Conveyor, Flexible........... Boat, Model of Full Rigged, Weighs Half Pound cco P Cea ROWE ARENT NETS Oe ae Boat—Motorboat Illumination ............. .Boat—Motorboat “Miss America II” is Fast- SO SY Na i.ck cnet seve 000000604 4050040 Boat—Motorboat Shaft Log, Reducing Noise ey SR MES on ane s005.0990 006404440 5%6 Boat—Oil Burning Steamer for U. S. Cable IE oi 2 aes ca ibh een ahah sb OEE b oe ae OS Boat—Oil Tanker Cleaned with Air........ Boat, Old Large, Found Under Big City.... Boat—Packet Comes Back, The, by H. H. Beat Paddle’ Wheel Motorboat Built by French Amateur ..... cece ecccseseccceces Boat—Painting a Seagoing Barge.......... Boat Portage in The Congo by ranwe Rail- way, by Henry S. White.............0.6. Boat Propelled and Steered by One Man.... Boat Propelled by Endless Chain 416 1l 727 322 101 838 181 825 549 244 585 947 717 344 901 905 476 Boat Propeller Blades, Grinder with Flexible ON —=Ee er ere Boat Propellers, Shrouded Screw........... Boat—Pump, Bilge, for Launch Electrically CORO an. oo 6.0r 066.5660 45 60404060000060.006 Boat “Quest,” Antarctic, Equipped for Hard- GRID BNE BOPVICS <occcccecsiccccccccescsce Boat “Quest” for Antarctic Expedition Boat — Sampan, Japanese Crew Rescued from Waterlogged, Boat—Scout Cruiser “Milwaukee” Launched BR AE aaah oo 80 4nee seb ebenneenesenewe Boat—Ship Accorded Universal Honors, by ree — Crushed Bow, Makes Distance Boat—Ship Frozen in Ice Forms Drydock. Boat—Ship “Golden State” Breaks Record. Boat—Ship, Naval Air-Service, for Handling Blimps and Seaplanes.............+-.++-- Boat—Ship, Ocean Going, Print Shop on.... Boat—Ship, Oil, Bunkers Four Ships at Sea PE pic cssvedewas es eneeeeeeees Boat—Ship Operated On for “Iron Sickness,” ar Se me SO. V nnce cee nenscornssacee Boat—Ship Shop Carries Full Line of Mer- chandise | weat—tinasdy Motorboat Defeats Train ey yy eee eer rrr ree Boat—Steamer Berths on Pivots Prevents PE - i. cntécnstlepetenessassoeanes —_ Stores for Great Lakes and Ocean Har- Sr ere eee Boat, Submerging, for Off Beach Frolic..... Boat—Submarine, S-Type, Embody War Ex- DD chabavadeb acd de dedeieee kun én cdes Boat—Superdreadnaught “Washington” I ee eee ie cae ae oe 6 ai eek e Boat, Tank, World’s Largest, Oil Industry PE UE ne atnishcdees ee eedtecchetenaes ee Boat “Tokyo Maru” Destroyed by Burning POUGNNO ME GORE ci cccctercccerercvecses Boat—Towboat Makes Record Hauling of Mississippi Freight ...............--200-- Boat, Toy, Carries Windmill for Propulsion. Boat, Toy, with Removable Mechanism..... Boat Trip, Two Year, by Three War Veterans Boat Unloader, Pneumatic, Saves Labor.... Boat, Unmanned, Steered and Controlled PREY Gactédchoredevectacdaseaescees Boat, Unsinkable Hunting BOOS WEREMOE VERO ccccccccccncocecccccccs Boat—Yacht “America” Preserved by U. S.. Boat—Yacht “Delphine” Launched Sideways Boat—Yacht, Live Ballast for............... Boats—Canoes Made from Balloon by Cana- Ce Ce oo cideRibacanandneeneseeeves Boats, Duralumin, German’s Make Boats—Fruit Vessels, Benepe Air Ventila- Pe ee 8 2n4nde bce ane enteeendeeoteoue® Boat’s Fuel Cost Less Than Nothing Boats, Fuel Oil, Increase of................ Boats—Ocean Liners Stabilized with Giant Gyroscopes, by George F. Paul........... Boats—Ship’s Portable Milling Machine. Boats, Squared-Stemmed, Tiller for......... Boats, Wooden, Pontoon Bridge Built of. Body, Auto, Has Complete Camping Outfit... Boiler Deadplates, Repairing .............. Boiler Draft Indicator Records Variations. . Boiler Draft, Inducing .............c.ce00. Boiler Gauge Glasses Break, Why.......... Boiler Heater, Kitchen, Also Heats i Sere Boiler Lifting Attachment for Portable SRR SP er pare ens Boiler Priming, Preventing................. Boiler, Steam Heating, Built on Percolator PEE tc-bean6eewOtganebhss 40006 6e-eeee © Boiler, Steam, Vacuum Wrecks............ Boiler Water Gauge Automatic Safety Valve Boilers, Old Range, Made into Waste Gans. Boliers, Waste Furnace Heat Utilized in. Boll Weevil Cotton Sprayer Speeds Work. Bolt and Screen Holder for Tight Places... Bolt Setting in Concrete............cce.e0+- Bolts Expanded by Liquid Air Bolts, Rust-Proof Coating for.............. Bomb Explosion, Airplane, Lecse Firing Pin SED Sidcanbedses Ueaeenenheseke ks oaeese Bomb, Signal Smoke, Falls Ver ~ tty EE Bomb, World’s Largest Aerial, Makes uge SOT 6046006666 aSSEDEDSOSOKESOECOS EES ee eee ewer ee ey 177

ne aed he a i ee a ne lorie

Page 9

416 177 420 818 641 824 63 191 334 598 646 559 516 696 688 591 110 202 261 355

iy ili. Bilas satthdencrediat.

POPULAR MECHANICS INDEX, VOLUME XXXVI, Bombs, Depth, Testing Device for.......... Bombing Tests on Battleship “Alabama” Bone Structure of Lion's Briggs Book, Huge, on Truck Features Convention Book, “Mother Goose,"’ Has Pockets for Cut- Out Figures pe aa ica’ bee ae aia ai eg Gases I NE ie ew woe ad aie bikers a lence'e Books, Rotating, for Quick and Easy Refer- ala aii a isd aati aig: h aok bk Wiech WRTEYE lee Cs ae Boom, Auto Crane, Has Full Circle Sweep.. Boom, Stoppage, Stream Carries Logs Ee Be eins iin Gs a cin kek EMO ee he oO EOS es MENG Do bo ccceccenestuecacecass Booth, Dressing, for Red River, North Da- a iltinie akg adn wiatin as > Wiaiee wis wa ae wes C2: Booth, Information, for Tourists. , Booth, Roadside, at Small Cost..... ‘nis Borer, Power, Quickly Removes Stumps. ae Boring Bar Cutters, Adjustable............ Boring Bar Cutters, Locking............... Boring Mill in ea ace cn tps CS as ik ccske ce dmeeeeeewie Bottle Lifting with a Straw............... Bottle, Milk, Carrier for............ccecesee> Bottle, Nursing, Sanitary Rubber.. Bottle Rinser Fits on Faucet............... Bottle, Sharpening Scissors on............. Boulders, Stream, Large Veranda Made of.. Bouquet, Carved Rye Bread, as Gift to Mrs. NS tated a Siala inf as Wicis wie siete win 4 k's 6 OK C'S at Bouquet Preserved in Silk Bag............. — Spotlight, Singers Face Illuminated ah aie te ase wig 4a e We 1 @ Goda wie we Wow ee es MN IR Sy Gio sca Wle'4 016 wow ole'e ewe we ee eee een Box, Inexpensive Collection................ Box, Resistance, Improved Feature of...... Box Shifter for Docks and Warehouses..... ey BEG, PONG “NOs otc osc kssceceveecs Boxes, Core, Shaper Used to Make.......... Boxes, Laundry, Move in Endless Train..... 3oxing and Crating Course at Forest Prod- BS Baar Boy Scouts Build Mohawk Village.......... Brace, Plumber's Rachet .........0ccccccoee Bracelet, Feathered, is Parisian Conception. Bracket, Lamp, Adjustable Compact........ Bracket, Shade, Accommodates Different Lengths ei ries TA tre ioies aed Sine Gash te achat DAD Big lo ais srake, Hand Lever, for Freight Cars...... Brake Lining Cutter Has Transverse Motion Brake, Sled, Makes Coasting Safe.......... Brakes, Rachet Hand, for Freight Cars..... 3rakes, Squealing, Compound Prevents... Brakes, Steering Wheel Operates, for R: il- a. fh a ee ee Branding Dies, Wood or Leather........... Brass, Antique Green Finish for........... Brass, ge eee 452, Brass Made Tarnish-Free with New Lacquer Bread Knife, Serrated Edge................ Bread, Rye, Floral Gift to Mrs. Harding Made Sr ee rr eT eee Breakfast Nook, Easily Made.............. Breakfast Tray, Wicker Secretary.......... Breakwater, Long Beach, Protects Lawns. Brick Wall, Hollow, from Regular Size Stock Bricks Cleaned of Mortar by Broad-Faced SUSE Ee eae eee Bricks. Peat, Swedish Government Subsidize EE aah cua e aod atuh< cence Bridge, Canadian Bascule, Made as Two. Bridge, Concrete, Broke in Two by Flood. Bridge, London Tower, Antarctic Ship “Quest” Passing Through................ Bridge, Pontoon, Built of Wooden Ships.... Bridge, Steel Bascule, for New Orleans Lock TE eRe oa A We oth Bits Bridge, Suspension, Across Grand Canyon. Bridge, Suspension, Spans Ravine Near Win- Se ee eae Bridge, Timber Traffic, Spans New South Ed Said Aandi nw enedawakbecencias Bridge to Connect Norfolk and Portsmouth. Bese. Tower, Reproduced with Pipe Fit- iG ane ie Ota dk eh Soe bale dike 6 a de'na.u « Brides, Tube, and Mole Combined Planned + Cross San Francisco Bay, by Harry H. NG AG al 6-0 a ae whine tar dea. puna oekaki Bridge, Twin Double-Leaf Trunnion-Bascule, for —o— Mass. veyor Skull, by C. A. 1921 briges, C. A.: Ants, Feod Habits of. . Bacteria Preserved by Freezing and Dry- erry rer eee et eee ae Zalloon Trip Not Complete without Slide DEE Se ce b e hd wa eeke Reckhe Hebe aue ~— Structure of Lion's Skull Modified by Captivity .. Divining Rod, “Re al, Science of Developing a..... Earth May Leave Sun. Energy, Much, Would Yield by Little Dr ncttes eis ewes Fog Horns, Efficiency of, De termined from Temperature Measurements Furnace, Revolutionary Form of, Striking Results... nit Hammers, Qualities of... , Insects Appear to Be Chemical Machines Insects Display Sense of Property Owner ship + . . Mine Depth Limited to Earth Pressure Mosquito, Unknown, Causes Trouble in Alaska Motion Changes Size of T hing: North Pole, Wandering of. Oxygen Supply Controlled by Pee Ge ticesekvenenteenee on Schemes, German, for Secret Signals Sea Level, Change in........ Stars Appear as Points of Light in The Largest Telescope......... ‘ Steel, Soft, is as Stiff as Tempere od Ste el. Sun Spots Affected by The Fart! Gives ‘Hopes Mat- iives Heat Leak- Survey Marks Destroyed by Preasure PORE cikviuctasaesees ous ‘ ‘Teeth, Babies’, Sometimes Slow but BIGGS BORO ccc cecndssces ‘ : Vision, Center of, is Not Always Most Sensitive to Light........... : WROOS accacacee ore cand t : Watch Springs Bre ak in Thunderstorm, Why a sal dh ie tv tate ee ; Wind Direction, Peculiar Relation Le tween, and Ocean Currents that They Pt. Se 2. cinectosenecuns , Wireless Wave Length St: undards Estab lished in Quartz...... Wireless Waves Do Not Le an Ove X-Ray Work Facilitated by Bubbles Briquettes, Rock, Tested by Impact Machine Bristol, Jack A.: Photographing Yellow stone Park at Night...... British Thermal Unit Explaine d Broach, Adjustable Keyway. Broach, Drifting, Remedy for.. Broach Sizes, Measuring........ Broach, Stuck, Extricating o iene xXcesslve Broach Wear, Preventing Broaches, Dull, Improved with Oilstons Broaching Soft Stringy Steels ; Broaching Stacked Work,... Brogue, Imitation Leather Bronze, Gold and Aluminum, Amount 0! Thinner Required for....... ‘ Brood Coop, Individual, for Little Chicks Brooms Clean Log-Carriage Ways. Brush and Fly Swatter Combined Brush Dam for Colorado River Brush, Floor, Spring Handle.... Brush, Fountain, Has Safety Fuse Brush, Phonograph Record, Automatic. Brush, Phonograph Record, Follows Needle Brush, Sanitary Shaving........ Brush, Wire, for Cleaning Metal Brushes, Turbine Washing, for Automobiles Bubbles, X-Ray Work Facilitated by, by CS. A, BA ccccousveowsse om Bucket, Grease, and Pump for Private GOFARBO ..-cccccccceses ites i Eee Bucket, Weighted, for We lis... Bucking Straps Trains Football Player Buckle Attached to Broken Strap. Buckle, Parcel Strap, Has Tag CE awalewda ke deeewes sence’ muaktainnt Gun for Cash-Drawer Budget, The National, by H. H. Attaching Robbers Windsor Buffalo Bill Shrine on Lookout Mountain by E. C. MacMechen......... ‘en Buffing Wheel for Tire Shop... . ; Buffing Wheel Machine Takes Articles of Any Contour Bugs Interfere with Apparatus Electrical

Page 10

10 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 a e-em, Federal Reserve, in Kansas

i “in benah ho anise Oeee cae as aaa ee dee 917 Building, Baptist, Moved Thirty "Miles by -_ ee ee ee ee vot Bulldigg. Belgium, Serves as Model for Office 892 Building—Church Front Moved Thirty Feet EN GEE vcccdadsetsseceeseeesvenene se 901 Building—Concrete Columns Give Roof Gar- Pe. NE, ho 5 605600046 00050046 0d 0s R08 06 237 Building—Courthouse, Illinois’ Oldest...... 908 Building—Dance Hall Illuminated by Elec- Ce PE ccc weveneedstbeeeesees see 16 Building, Eight-Story, Moved While Tenants 2 ia cia ead Was mia ee week he belek Oo) ee 12 Building—Elevator, Chain-Cup Grain, of _— Pe SE . .cececeeeeseeuew pee ged ene ee 358 Building—First Government School in Eng- i Eee error erro rT er re Tee 104 Building, Four-Story, Explosion Wrecks... 59 Building, Garage, Has Elevators and Con- a 1.3 BRPPULTECOTTCTT CTE rer TTT rr 751 Building—House, Beautiful, without Walls or Doors, by John Anson Ford..........-- 668 se Community, Erected in _— eeceeeeereceeeseeeesr eee eseeeeeeeeesesenens ‘ es) + Aide Sg Metal, is Fire, Storm and EE, vnc cas ceceunededvutenectiaeeciaes 366 Building—Improved Method of Fabricating meoenes, by A. NK. BeOtl... .cccccccssccescoes 102 Building—Inn, Curious, Noted for Chicken PE s¢siccusnh vecbhee ried seeweeaaeae ee 908 Building—Laboratory, Japanese Inventors, CO TO TGS SH ROM IOs cas ccccdceseaecaves 80 Building Material, Asbestos, Good Proper- 5 ADOdb CERES CR ORM OAD Oe we wes 735 Building Materia =xpanded Wooden Lath is Competitor of Metal Kind............. 118 Building Material from Sugar Mill Waste, OF TMOG. MWR TODROT.. <csvcccvecevesess 806 Building Material—New Flexible Material ge eer ere 194 ne Material—Shingles, Asphalt, Tap- _ Pt. csubtavdastsaceasecuncdeoba wie iad bes * ‘ Building, Museum, Houses Army Motor ARS bas ek ek ba pebitakh site nakhaak as 564 Building, New Art, Planned for Amsterdam. 757 Building, Office, Has Conning Tower on Roof eS a eae ee 69 Building—One-Story Twelve Room Public SN, sa inh 45a) ke a ak a a ee a ee ak 121 Building—Pavillion for Stockmen Proves DD Deceacvateuciadawhaee se ee bapeanc Gee Building Record, Texas Bible Class Breaks. 202 Building—Sanitarium, Open-Air, Accommo- BL Beer rr eer rer 353 Building—Shed, New Type, for Housing Giant Seaplanes Skee et wk A ee eee nce ene 333 Building—Shrine to Buffalo Bill on Lookout Mountain, by E. C. MacMechen.......... 325 Building—Stadium for Illinois University... 214 Building, State Office, Planned for Chicago. 573 Building to Withstand Earthquakes....... 396 Building—Train-Shed Model for Chicago Building, 15 Story, Tennis Court on Roof of 179 Union Station ........... scccecesccoccooe S39 Building, U. S. Treasury, New Story Added to 816 Building Wrecked by Electric Freight Car.. 653 Building, 21 Story Office, Planned on Site of Old Fort Dearborn Blockhouse........... 439 Buildings, Civic Center, Proposed for Balti- rere cocescecsooscecosossocees SBS Buildings Moved Down- Hill coccccccccccece OL buildings, North American, in South Amer- REE asnceecnee (60666seses eeecebocenncesace SE6 Buildings, Rounded Corner, Has Advertis- ing Advantages ........... 616 Buildings, Seven, Grow Where ‘One Stood DS. ochenees asd euns P 425 = Three Wire Electric, Gives Triple Ser- 116 Bulbs, Electric, | *Displace "Radiator "Cap EE RPS ePrerrrT TT 759 Bulbs, Electric Light, "Rack for ‘Displaying. 71 Bulbs, Electric, Machine for Purification of TOROOO EB. ccccccccasseseses 0020008e 4 Bulldog, Bird, and Squirrel are Fast Friends 251 Bullet, New Expanding ........cccccceceese 382 Bulletin, Weather, for Airmen............. 234 Bullfight, Humane, is Novel Affair, by Frank i MD. we waseeccs densa Wasenchaceves ee Bumper, Auto, Convertible into Tow Bar... 351 Bumper, End- of-Track Railroad, Stops Cars Gradually ...... sedceetvoccee Bee Bumpers, Wood, for Automobiles........... 236 Bungalow, Auto, is Official’s Quarters...... Bungalow, Concrete, Made in Two and a Half Hours .... eoece Bunkering Four Ships ‘at Sea Simultaneously Buoy, Line Carrying, Serves as Life Pre- BOPVEF cccccscces 08ee6ee Bur, Puncture, is. New Pest. for" Motorists. Burglar Aleem, Bank, Works on Open Cir- Burglar Alarm Circuit sbueees imorinen~e Burglar Alarm, New, Phones Police. teeneee Burglar Alarm, Spring-Operated, for Doors and Windows ...... Burial Place of Ancient’ Hawaiians, ‘Extinet Voleano was ... Burial, Vault ....... Burner, Homemade Oil ieneeecenes e Burner, New, Increases Size of Heat Flame. Burner, Oil, Perfect Combustion Flame Cre- BHOG BH cvcvcoeces re Burner, Oil, “Replaces Gas. eae aaen seuduseoen Burner, Swinging, for Gas Stove.......... Burners, Open Flame Gas, Wasteful.... Burns, Picric-Acid Solution for............ Bus, Detroit Motor, Design Innovatiors Mark Bus, Hotel, Luxury and Comfort Fea.re... Bushing Press, Air Operated, Works with One Stroke ........ Bushing Remover, Handy ag ek iia ie tetak aie a a Bushings, Ball- Bearing, Show Less Tractive SLE EPTFE TERT COCEE TO Business Near, Better, by H. H. Windsor.... Busses, Jitney, for Kansas City ~*~ Motor, Have Ten Year "eicaspoly in DE stenaseusaietenn weonee Bust of Cardinal Mercier. eee Bust of Italian Poet “Dante”............- Butterfly Breeding —— began by "Maine Woman, by Sam E. Conn Button, Collapsible, Premature, — ee ee ee re ee for Stiff Buttonholes. ‘ Cabin, Curious ae Officials ..... Cabinet, F iting, BOUED .n on wns sincere Cabinet Joint, Practical. bbbowne Cabinet, Window Display, Presents Lifelike BOONES cccccccccccccscscvecesececses “ae and Wire Stringing “Along Right “of ee House Crater-Lake Park Fool-Proof, for The eee eee ee twee ‘Steel eeeeeee Cable. Cars Guided by Rollers Around Curve Cable Communication of Stranded Officer WOE “WOE DOUUOS cccweccccceccsvesaecace ° Cable, Land Telegraph, Laid by Airman.... Cable, New York—Chicago, is Engineering I ia aac ah ds a it ig etek eco Cable, Rope, is Size Record Breaker. Cable Service, U. S., Oil-Burning Steamer Pe arn nie de a Onin is ot enka mint In a in cana ie 8 aha Cable Tramway Across Colorado River. eee Cable Terminals, Removing Corroded Cables, Logging, Hook Lock for.......+.+. Cables Removed While Power Continues Cableway, Aerial, for Island Campers...... Cactus Made into Fodder by Blowtorches.. Cage for Baseball Umpire.........cccccsces Cage, Largest Bird, Huge Steel Dome is... Cage, Traveling Crane, Makes Operator Safe Cage, Wire, “Wild Bill’ Statue Protected by

Cake, Ice Cream, Serves 2000 Persons....... 8 = Salts Essential to Good Nourish- Calculating Ynstrument™ ‘for ‘Bianking *Pres- reer rar Fadonneeseus Calendar, Perpetual, for Watch..... Calf, Vaccine Removed from.... Calf with Two legs .... Calibrating Pressure Gauges... Ge DD evs nccdadeasecsisncsebec Cameos Formed by Minerals Dripping from Cavern Roof . ° Camera and Phonogr raph ‘in One Fn see a ae te Camera, High Speed Motion Picture, for PE EN nnn dbds dt bn ed ecesesneanede Camera, Motion Picture, Operated by “Elec- SEE itn. coheed eee whee ° Camera, Rear Shutter Control for. seek erues Camera, Twin-Film Motion Picture . Camp Candlestick ....... . Camp Fire Stove, Folding e ce Se SOD cccasasocewedtoeen eeee Camp Stove, Folding, Burns Hay, Wood, or Straw eee eee eee ee ewe eee ee re seeee eee ee eeeee eee ween ee ey 391 232 616 aA teed

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C C C Cc C « if C € ¢

Page 11

73 343 779

ate 0 Aili MORRO clit te PER >

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Camp Water Made Drinkable by New aeessaia Campers, Island, Aerial Cableway for. Camping Auto Body Has Complete Outfit. Camping Auto with Launch Top Camping, Homemade Pump for Camping Kettles, Handling................ Camping Kettles, Holders for Can Covers, Tight, Removing Can Opener, Mechanical .........+...eee00% Canadian Route to Pacific Coast Now Open. Canal, Concrete Irrigation, by A. J. R. Cur- eR ACR Aiea Riese iti a hide OA oe od a SL Cancelling Machine, Stamp, for Letters.... Candelabrum Made from Coat Hanger...... Candle Holder, Christmas Tree, that Bal- ee, NS ag bated i oo we we eae Ce, DEOOINGE once cen evewesveonne ‘ Candlestick, Handy Camp...........s+se+0. Candy, Computing TD RPP rr re ree re Cannon, Alloy Removes Copper Deposit in. Cannon, Ball-Pitching, Tests Players’*Skill. Cannon, Firecracker, Breech-Loading...... Cannon Form Fence Along Street........... Canoe Covers 8,000 Miles............ Canoes Made from Balloon by Canadian rer mr rn Te er ee Cans, Milk, Made to Look Old.............. Cans, Waste, Made from Old Range Boilers Canteen, Auto, is Well-Laid Dinner Table.. Canvas Belt Conveyor for Red-Hot Glass.. Canvas Leggings, Hip-Length, Protect NS oe iat he tke i a ig ak ie aoe aie a Canvas Pipes, Water Filled, form Tempor- ary Dam Car, Open-Air Observation, for St. Paul Rail- ESS ae ere errr rrr rer ee Car Tipple, Automatic Minme......ccccccsccecs Caravan, Automobile, Warmly Greeted in 0” BR ae a ee ee ee ee ere ae Caravan, Motor, Homesteaders Go West by. Carbem CIOGRINE DGVICS. 6 occ cccccccvcsscce Carbon Removing with Spiral Spring..... Carbon Steel Tool for Spring Thread Cutter Carburetor Float Chamber, Cleaning....... Carburetor Heating Device for Autos....... Card Case Protected from Tearing......... Card Fastening in Loose Leaf Binders...... Card Holder, Score, Clips to Table......... aay Players, One Handed, Hand Substitute hee P Ree RAKE A COTS WEY Se ee ee ke COPGRORTE Bere BOK... ccc cc cceceescevecven Cardboard “Instructor” Teaches Army Sem- re Pre re sree re Cards Mailed Careless Motorists........... Carnival, Water, Moah’e Ark. ..c.ccccccccces Carom Board Stand, Revolving............. Ce I So reds di ewascbdscuesceeee CaPOte, CIOCRORDIRG TOP. nc ccccccccsececsece Carrier for Green Cement Blocks......... Cormeen SOG Bike WOCGIOG. occ ccc cece cvess Cars, Cable, Guided by Rollers Around Curve : Cars, Freight, Wood Planks Displace Steel RR, dena heehee eRe WE ORE ho bee woes Cart Carries Big Bass Horn.........cccccee. Case, Geer, £OG COPPVINE. 2c nc ccscwscncese Case, Money Carrying, Has Alarm Lid..... Case, Traveling, for Small Articles......... Casein Glue, Chemical Reaction Affects Casein Glue Joints, Machining............. Cash Drawer Robbers, Buckshot Gun for... Casings, Sectional, Save Pneumatic Tires.. Cast Iron Blocks for Road Paving esc on bbas a eid bbs @ aw eee Casting Bevel Gears Casting, Centrifugally, of Solid Concrete Pt cia-tivaetisidcakchthnenee evades Casting Ship Propellers..............--+++. Casting Testing, Hydraulic Pressure for... Castle Built on Cliff is Movie Scene........ Cat Climbs Ladder to Bed on Ship......... Cat Taught to Strike Typewriter Kevys.... Catapult Launches Airplane from Battle- Na Sods asian gins a) Oh kas Aas SOR Oe eee eo catapult, Roman, American Reproduction Cateh, ” Pocketbook.” Safeguards Against . | | “Ree Ce WM... wa paceasevessedes Cave House of Boughs and Thatch......... —— Sequoia Park, Fat People Not Allowed Cave Treasure Hunting in Coronado Islands Cave, Widow Derives Income from......... Cavern Mineral Drippings Forms Cameos. Ceiling Cleaning Device....... 7" Celebration, Missouri, Depicts Old Celluloid Coloring and Decorating CCOtPNOe WAtGR CHPGUEs ccc de cevccvesvces Cement Bags Made of Special P ape r Cement Blocks, Green, Carrier for. Cement Coated Mud louse. SS ae ‘ Cement Filled Cavity Saves Tree........... Cement for Mending Porcelain... a5 8 Cement for Steam or Water Pipe Joints. see Cement Forms, Timesaving Cement Heads, Grotesque, try Estate T imes.. Ornament ‘Coun- Cement Kiln, New , Type, -_ ith ‘Automat ic DE aciVstscc Sa cia hen eewerneede eens <r Cement Post Wire Attaching Census, Library, Shows Need of Extended PN “chia 5 bash oats ak Census, Sixth Decennial, ‘Canada Takes, by PP) DIOS Savca bik ee tee se se oe , Centennial Arch in Ottawa. . : Centennial, Missouri, Depicts Old Time Center Finding of Work Held in Millin Ws 2b oe kd oie ata vie aw eee Center Grinder Made from Drill Centering Attachment for Try-Square... : Centers, Stationary, Finishing Work Be- DE chat cEaad as ee he ei ow aba e< oi Centinedes, Wavy Motion of.... sie . Certificates, U. S. Savings, Contest for Sell- i Actin tcioce Cte ate eene ehbeeaae eur ; Chain, Elastic Key Ringe Chain Fractured by Oil Tank Chain, Nonskid Tire, Clamps to Spokes E Chain Portiere, Novel, Carved with Penknife Chain Repair Links Made from Staples.. Chain, Tire, is Quickly and Fasilv Attached Chains, Dragging, Protects Gasoline Trucks Cee, ee I Rs oo vad vod wesedeon en ‘ Chair, Aquatic Arm, for Bathers Chair and Stand Combination Houses Tele- ee Pe eee ‘ Chair. Children’s Haircutting, Horse Feature Chair, Collapsible, Chair, High, Baby ere re ary ee ad ‘ we Chair, Kitchen, Has Manifold MOOG, 6s c«0cs Chairs, Convertible Garden..... Chairs, Motion Picture, Elevated ESAT er ee Ore OCLELLPTEEEe Chalk. Tool Modeling with. : Chamferine Tool, Portable Grinder as Channel, Embankment Making Across Channel, Shipping, Onened by “Underw ater Plow.” by P. F. Snitzfaden..... Character, Moral, Revealed by Device Coe SOOT ESOS EOE SESS EEE ELESS Charcoal Bathtub Filter........ Charcoal Made from Wood with SE, CE en cvicenes Chart, Temperature Recording ee ; Checkerboard Has Attached Playing Coun- BOTD wee ee ehe eke ee Kes atesesereseosenesesss Checkering Flat Surfaces.............. Checking Device for Draftsmen.... sae Cheese, Swiss, Power Press Aids in Making Chemical Dandelion FEradicator............ Chemical Fxtinguishers Unsafe in Mine Fire Chemical Machine, Insects Appear to Be, by Explosion.... ‘Seat and for Tourists Jumper, and Gocart in ‘with Pen- ‘Engine ee rrr hd oe wk a Chemical, Strong, U nderground Streams py, 8 PRT Teeter re irerrerre Chemistry, Canadian Institute of, Announces BOE GROG sstecuersesasesoeser + awd Chess Set Made of Aluminum Chickenhouse, Cleaner for. Chickenhouse, Draftless Ventilation for. Chickens, Farm Sign for Selling. Chickens—Hens, Yeast Feed Not Good for. Chickens, Laying, Device Spots Chickens, Little. Individual Brood C 60D. for. Child Feeding Fund, “Heart of Gold” for eo eer eee Children—Picture Stories Denartment.. cette éthbdede neon 120, 280, 440, 600, 760, Children’s Barber Chair, Seat and Horse TD ‘cnc wie a eee Seow e ORES ay Rates Children’s Jointed Toy Forms Birds and REE ASIP toe ne ; Children’s Play Combination of Slide, Coaster, Seesaw, Trapeze and Merry-Go- _ | | Sener ee : Children’s Ride, San Francisco Park Has. Children’s Swimming Exercise.........

Page 12

12 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Children’s Toys ‘Made in America” Teach and Train, by Harry A. Mount Children’s Worn Stockings Made into Socks : China Clay Drying, New Method for Chinaware, Broken, Cement for............ Chisel. Broad-Faced Chipping, Grinds Mor- SE bd aed ode DO aco ew ween es Chisel Handle and Offset Gouge............ Chisel, Handle, Nonsplitting................ EE SE OPER Ter errr Chlorine Purifies Bathing Beach Water.... Chopper, Meat, Improved Electric.......... Christmas Tree, Giant, in Yosemite National PE cS ek PERERA oa eRe Ree Oe OS et Christmas Tree Light Sets Now Obtainable et SE BERD tnt occu andeeneacse nee wwe Christmas Tree, ROtary.....ccccsccsccevcce Chuck Lathe, Bench Stand for.............. Chuck, Machine Tool, Patent............... CEUGK TUNE, URIVETBRL... «oa ccorcrcvcccses Church Bell, Master Clock Rings —— Clock Has “Glory Be To God” on RRA ARS neat eerie pare eee Church Front, Stone, Moved Thirty Feet with PS reer rte ree re Church Made of Tufa Rock.........-...++- Church on Wheels, Goes to The People Church Organist, 72 Year, chanics Subscriber Church, Pastorless, less is Popular. Me- Hears Service by Wire- ee ee ee i Di edad &e ahele Waka ae eae d ee ane aen wee Ne church’ Tower, Falling, Remarkable Photo Churn, Quick Buttermaking............... Chute, Ash, from Stove to Basement Cider Barrels Kept Air Tight.............. Cigars, Burning, Holder Carries............ Circuit, Burglar Alarm Circus Day, Miniature, in Florist’s Window § Citizenship Allowed Sioux Indian.......... 103 Citrus Orchards Protected from Frost by ee ada eS A kh he A ee ee ee 678 City Service, Greatest, Prize for............ 479 City-Beautiful Movement Aids City Boost- SE See one co ohh ecb nie Mae Marae Meee ee eee 539 Civic Center Established in Baltimore...... 838 Civic Features........ 108, 268, 428, 588, 748, 908 Civic Rivalry Prize Offered Shawnee, Okla... 479 Civil Engineer Poem, by Lydia M. D. O’ Niel 480 Civil Government Flying for 1920.......... 533 Civil Service Examinations, U. S., for Sur- WEY COMPULOPE .orcccccccccsevccsvessccve 799 Civil Service, U. S., Engineers, Draftsmen, _ and Surveyors Wanted by..............-. 159 Civil Service, U. S. Wants Assistant Me- chanical Engineers Pre Pree Cer 639 Civil Service, U. S., Wants’ Instrument ee TT Pere rr rT eee ee er ee 479 Clamp Binds Railroad Car Wheels to Rail. 402 Ce WOE ca vscncvasveseverevece 00, 769 CHBMED FOP MARY VWROR. «co rcccccvcsesecsesecs 457 Clamp for Multiple Cutting................ 769 COBEN, EMEMO TOE Obes ccc ccecicsccsivcercs 458 Clamp, Miter, Holds Pieces for Joining.... 277 Clamps Made from Steel Washers.......... 606 Clay, China, New Method for Drying....... 242 Clay, Georgia White, Resembles English EE os inte edb ww kb ae ae 6 me hee eee 647 Clay, Making MeGeling. ....cccccccvcccseses 793 Clay Model Filled with Concrete Equipment 747 Cleaner, Automatic, and Loader for Sugar Beets, by Frank B. Howe..........++..6. 576 Cleaner, Automatic, for Phonograph Rec- Dt cscs cbhss ck vane iéu eed e bao dues eee 244, S44 eer 776 Cleaner, Electrically Heated, for Auto Wind- EN os a ia hee ie © AR eh ie Ee om ee 595 Cleaner, Kerosene, for Use with Hydrant.. 944 Cleaner, Sandblast Spark Plug............. 933 Cleaner, Street, Multiple-Unit.............. 401 Cleaner, Thread, for Machine Work Tools... 942 Cleaning Aid, Compressed Air Connection at Ee eh aa a ee AAR OE DN 4g peek MNS 404 Cleaning Brush, Fountain, Has Safety Fuse 256 Cleaning Device for Ceilings............... 915 Cleamine, POURtain POR... 2... cepecssccresece 945 Cleaning, Hand, Vaseline and Cold Cream NE te GS ak cian ars eae ae 6 an ue te 0 al ale 945 Cleats, Vanishing Tractor Wheel, Spare a errr reese 107 Clerks, Qualifications of, by H. H. Windsor 347 Clinic, White-Plague, Traveling............ 265 Clip, Tag Attaching, for Parcel Strap Buckle 5 Clipper, Horse, Bicycle Drives Clippings, Collection of, Presented Mme. CE ctisccakpeeWeeninuikbniwe een ba ees ante & Clips for Drawing BoarG....cccccscccscess Clock, Big, San Gabriel Mission Tower Re- Se Ce soc ddawesbieutevasee sens diene Cock, © pepe Has “Glory Be To God” on Clock. PREG TRIO. ace wececesceresvenve Clock Made from 50,000 Pieces of Wood.... Clock, Master, Rings Church Bell........... Clock System, Watchman’'s Round-Recording Clock Tells Garden Planting Time Cen, “eM 6 oink oxo ia dee wd Wonder Clockwork Controls Traffic Regulator Cloth, Lifelike Posters Made of............. Cloth Made from “Kapok” Tree Fiber Cloth Shrinkage, Machine Tests............ Cloth Strips, Piston Rings Removed with.. Cloth, Tracing, Eraser Using on............ Cloth, Water Soaked, After Pueblo’s Flood oe RS Oe BS era Clothes Cleaning, Disinfector for.......... Clothes Wringer, Centrifugal Electric...... Clothesline Pulley Automatically Cleans Pe, SN DR ccnteas sande Gees neesee cae Clothesline Support Uses Multiple Lines.... CUOCMORIING TEMBMCOMOPS oc ccccccsccscsvccess Clothespins for Holding Washcloths....... Clothespins for Rugs or Carpets............ Clothing Dummy Feet Adjusted by Simple REE Sa Uecikdwiceeastey ease ead ces sae Clown Toy, Performing ee — 14 Seated, Made from Low Priced EE re Per hr rare a a ea Coal, Burning, ,and Nitrate Destroy Ship I, {SI os cain 901d) oh ee dle paiva ea Gl ae @ Coal, Chinese, Shipped to United States Ea Ga aig ae: eae Coal Conveyor Across River on Unusual Pe hoe ken CG sabe wb bee bn weedee eens Coal Grin@ingg for Colloids... .cccccscccccs Coal Mine Cutter Cuts Any Direction...... Coal Mine Headlight Lamps are Menace.... Coal Pile Hot Spots, Thermometer Shows... Coal Pile Wall Made of Sectional Hollow NE 2 oa ah he Cw aah e Wie OE ie ee eee ak Oe Coal Scale, Automatic, Checks Fuel Con- aE yr ret Pat ree eee Coast Erosion, Concrete Walls Protect Coaster, Four-Seated COBBCOr GORNNS, TREOOS. .... cc ccccceccccccsces Coaster Track, Kiddies, in San Francisco SIE “Sila kas GNA RACGP ac Olle ai Oh we eh wok Oe a a Coat Hanger, Candelabrum Made from Coat Made of “Kapok” Fiber Cocks, Service, Wrench for................ Cocoanut Palms Have Tin Ring to Foil Rats EE, cc. wet beth Sidcwneawaheebeceee BPP COC TE UL COTTE CT eT Cocoanut Trees, “Keep Off’ Signs on...... Code, Army Semaphore, Cardboard “Instruc- De Se ce Eee eee bib abe ibe a cee ae 246 ee Code Signal System, Fog, for Ships........ COGS, BEGG THPOWTGE «ccc ccssccscccce ee reer ry Tree err Tere Coin Counting and Wrapping Machines, pS ES aaa eer ee eee eee ree CORR, PRIME, TGRDIOS TOR. cececcsccccesss Coke Buying, Turtles Stimulate............ Coke Shortage Relieved with Oil in Austria. Cold Saw Breakage, Preventing Cold-Storage Houses, come Collar, SO obo oS SFOS Sb ENC H4 OH4O HE THES SOARS CE BO OHS Collection Box, Inexpensive................ College, for What is The, by H. H. Windsor. College Laboratory Has Elevator Black- DE. cngwdstorrd dh bees Pesesdetsadvesecee Colleges Compete in Aeroplane Race...... Collets, Push-Out, Making................. Coloring Brass, Copper.............ssee0. 452, Coloring, Gem, with Radium COREOER, TOOTMONVERE, 2c sc cccccec es cveccecvcese Columns, Concrete Building, Give Roof Gar- Pi PE ek wb sah Venn eed hae et eee enna s Comment and Review, by H H. be ag red eeeeeeseseseesresesesesreseee 27, . Commerce Bureau Renders Important Serv- NRE SE Por Ory SE TT TTL eee Ce Commutator Slotted in The Lathe.......... Oompass, Deadbeat Magnetic, for Oe EP rrr ry rere srry eee ee Compass Stiffening ..........-eeeeerevevens Hot Rooms_ May Be- 862 444 MRD Swe A A AHH ARANA AN | Q nahahn felUlUhktlUC MF AAMC CUO KC MTC AAAS

Page 13

er id

Ne ae Rr eo co ml he.

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Compass, Wireless, Lighthouse “Tulip” Has, OF ee ee Pvc ec cececcteduacnencees Compressed Air Connection at Switch is SE NE 0.6650 06054045000640050.006 6% Compressed Air Quarrying, Novel Method of Compresses, Rubberized Fabric, for Throat PE BASU DAGON EUES NOs o8Gd 6K 08.06 006 0% Concrete Aggregates, Size of............... Concrete Bandstand for New Orleans Park. Concrete Bandstand is World War Monu- Dt Stier ei eh thataddnae canna eco nsaoacees Conerete, Bekt Getting im....cccccceccces wae Concrete Bridge Broke in Two by Flood.. Concrete Bungalow Made in Two and a Half DOOMED «cece SeeWbsheetavatinswessusuee we Concrete Columns on Building Give Roof Garden Effect ..... ree ee ee Tree eee Concrete Drain Removes Oil WEE BAUME CADN Ek Cee ase escadeancrsoéences Concrete Equipment Built to Fit Clay Model Concrete Feeding Floors................0- Concrete Floors, Lag Screws for.......... Concrete Garden Furniture—Part III. Plaster ME) Aig be 666a54%45%%000600 bbegnrveaedea Concrete Garden Furniture—Part IV. Glue Moulds ...... ctecCee ce eeNw abs Concrete Mixing Truck Mixes on Way to WEE ccsece P Cee eee eee eee etree eee eeeeeeeese ee ee ene Concrete Pavement Finishing.............. Concrete Piles, Bamboo Reinforcement for. Concrete Pools, Ornamental ............... Concrete Reinforcing, Barbed Wire for.... Concrete “Safety Isles,” Unsafety of....... Concrete Seats for Visitors of Southwest Coast Towns ......... PE Ce ee Concrete Sewer, Closed, Creek in Buffalo _.. i Ree ee eae Concrete Shapes Centrifugally Cast......... Concrete Shore Line Holds Back Sea Tide... Coane | een Ornamental Garden Walk PEM LGrlbah wenw One 4a-aS Vos 696 Whoo ode . 2.) irr eieeteate: Connection, Compressed Air, at . - SSeS aaa epee epee Connection, Multiple, for Electric Utensils. Connector, Spring, for Dry Cells Conner, Sam E.: Butterfly Breeding Ranch Run by Maine I tata Diag Poh ea aNd jel iia ee a es Ship Operated on for “Iron Sickness”..... Conning Tower on Roof is Pleasant Retreat Container, Metal, Cleans and Protects Spark atid wanes baie d 06s Cd sedeksncawne Containers, Steel Freight Unit, for Railroads Contest for Selling U. S. Saving Certificates. Contest, Greased Pole, in Water Contest, Orchestral Composition, Open to MMMBTIOOR COURDOGOFE oon ccccccccsccicccs Contest, Scenario, Prizes Offered in......... Contest, Word-Building, Prizes Offered in.. Contractors Names on Large Bank Building ee ee ee ee ee ee ee ee a es a a Converter Makes Gasoline from Fuel Oils.. Conveyor, Box, for Docks and Warehouses. . Conveyor, Canvas Belt, for Red-Hot Glass.. 13 Conveyor, Coal, Across River on Unusual ie een eee ene Ketek abla ceed bee 563 Conveyor, Ship Loading, Flexible........... 901 Convict-Operated Game Farm, World's Only, by Lawrence William Pedrose............ 547 Cooker, Exhaust Pipe, for Tourists........ 654 Cooking Heat Medium, Sun Rays as........ 24 Cooking Machine, Doughnut................ 5387 Cooking Utensil for Broiling Meat Over # SE DE a wccdsad erro ees See teens soeen 753 Cooking Utensils Fits Auto Exhaust........ 820 Cooky Pan, Aluminum, Fits Any Oven..... 752 Cooling System Pump Makes Motor More DE. ccckine deane GAs sk ab ns Bae eenee 384 Coop, Individual Brood, for Little Chicks... 438 Copper Coloring’ Brae. ....ccccscocccsscess 452, 782 Copper Covered Ship Hulls Not Impervious OP WON. canes ose cendedensaseneeonsesens 244 Copper Deposit in Cannon Removed with BE. sasrvatenesdbspavssseravcatvtenes sae 88 Copper Lode Discovered in The Island of Yell 358 Copperplating Nonmetallic Articles........ 461 Cord Adjustor Made from Spool............. 311 Cord Used a8 Wrench. ..c.cccccccccccsceces 941 Core Boxes, Shaper Used to Make.......... 459 Cork Removing from Inside Bottle........ 795 Corn Sheller, Antiquated...........-e+e00. 367 Concrib Doors Held in Place...........+.+.-. 12 Corner Stone, Bank, Trowel of Gold Lays POU FOE nc eee ces cherecscnesensesansense 74 Correspondence Courses, Photographs Teach EAM FM nc etc cc cesesecvcvercaseconas 105 Cots, Three, Made from TWwo..........e656. 311 Cotters, Magnet Holds..........-cecsseecees 935 Cotton Gin Saw-Filer, Rotary, Operates Automationlly ..ccccccccecccccccescccccs +4 Cotton, “Kapok” Tree, Made into Fabric... 262 Cotton, Pulverized, Used in Many Industries 539 Cotton, Roads in Imperial Valley Paved with 876 Cotton Roller, Hand Operated..........-5+.5 362 Cotton Sprayer, Improved, Speeds Work.... 332 Couch, Steel Sanitary, with Adjustable Head ete OO errr rrr Te eT ere 2 Counter, Meat, is Also Refrigerator........ 568 Counter Panels, Screen, Prevents Drafts.... 617 Counterboring Device, Useful............+- 926 Counterboring Tool for Inside Faces....... 616 Counterfeit Money Printing Machine Proves — SS rarer es seeees 51 Counting, Coin, and Wrapping by Automatic 336 DORR 5c dcnccceceseasvosegcveercesrncs b+. Coupé Rear Deck, Extension of.......-+++5 ee Coupler, Automatic Car and Hose.......+-- ty Coupler, Tesla, as Wireless Aerial.......- $39 Coupling, Universal Emergency....-++++++> 46 Coupling, Flexible, from TiresS......--«+++> 44) Courthouse, Illinois’ Oldest. ......--+-++s++> . Courthouse Provided with Rooms for Jury 439 SEE EES aE ey ST ey CL, : Cunnen Tennis, on Roof of 15 Story Building eis Cover, Dust, Protects Auto Interior......--- $41 Cover. Sanitary, for Drinking Glass......-- H+ +4 Cover, Telescoping Typewriter.....-.+-+.++; 7 Cow Derails Train by Being Thrown Against 519 SE. oc keene ede etna hoes seas See peeee Crabs, Land, Foiled by Tin Ring on Cocoa- ave ee Pe Coke be osc 00 bee ces se s0see eee ewe 4h, Crack Sealing in Storage Batteries. wstseeee 931 Crane, Auto-Truck, Has Full Circle Sweep a3) Crane Cage, Traveling, Makes Operator Safe es ; Crane, Contractor's Jib, How to Make...... 23 Crane, Heavy, Transported to Mexico in — Record Time .....-cccsecseserecsssvecess 711 Crane, Lifting, for Helpless Invalids...... 700 Crane, Portable, Boiler Lifting Attachment ~ ee een coer Creer eee eewe® ‘ Crane Tower. Concrete@......---seeeeeeeere 330 Crank, Auto, Used for Backing Auto........ 794 Crankease, Auto, Radiating Flanges for.... 277 Crankecase Drainings as Fuel......... oore >: Crankease Oil, Tractor Attachment for Draw- ie SS ero eee eee Le 292 Crankente Oil, Used, Reclaming Outfit for.. 827 Crankpin Turning Machine, Making a...... 930 Crankpins, Grinding ........-+cceeeeeeveees 621 Crankshaft Handling Truck........ osccess 618 Crater Made by World's Largest Aerial = rrr rrr Terrir ee ° int cao Crating and Boxing Course in Forest Prod- — WGtS TADOTMEOET 1c ccccccsesvcsescvesnes - 9 Cream, Cold. on Hands Aids Cleaning...... 945 Cream, Fresh, Made Cold and Preserved for DOCRTRE BOON codices csavess sh hs 30 ap SS kt ~« Bae Creek in Buffalo Made into Closed Concrete _ De aeons eke see eee» Sx eetete ve 406

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14 Creepers, Shoe, Makes Slippery Walks Safe Crib, Baby, Folding Auto........csecccccces Crib, Baby, for Motor Car.........e.e-6 Crib, Collapsible Baby, for Auto Touring... Criminals, Escaping, Signal Stations for CONOR cc kote ececececteenebeaseeseeeee Crossarms, Telegraph-Pole, Up or Down PESUSCIRORE BOF. ccc iccscsaressesescser see aa sage English, American Reproduction Crossbreeding Trees Strengthens Species, by BOOSEY A. TROGRE occ cccccvesessvccecccsces Crosscut Saw, One Man Seated Operates.... Crossing Barrier, Flexible Grade........... Crossing Sign, Railroad, Wrecked Auto Is... Crossing Signals, Human Semaphores as.... Crow Trap Catches Crows Wholesale...... Crowning Pulley, on Face Grinding Machine Crucible Furnace, LargeSt........s.cccesee Crystal, Unbreakable Watch en Pree ee Teer eee ee eee Cultivator, Late Model, Works Two Rows.. Curb Runway for Automobiles.............. Current Control, Triple, Studio Light Regu- I Serre ere Shi eres Current, One Million Volt, Transmitted Suc- "RRA rare err ae eres ene Current Resistance Box, Improved Features RE ei ee aa eee ee Curtain, Electrified, Fish Avoid............. Curtain, Theater, Stereopticon Feature of, et SERCO Bee RNs cok cscccesanareane Curtains, Steel, Make Windows’ Bandit- ee RSP i ein re ee ee Curtis, A. J. R.: Irrigation Systems, Concrete Curve, Flexible, for Draftsmen oe See WP URCUPS, TE UMNOIINO. 6 «oo cine cbcnccsecad Cutlery, Household, Sharpening Machine for Cutter, Bermuda-Grass, Renovates Lawn... ey Brake-Lining, Has Transverse Mo- . er ee ree Cutter, Coal Mine, Cuts Any Direction...... Cutter, Lathe Thread, Uses Carbon-Steel EE Ab Go's Scien eek ak MOLES eee Seeee, Sees. BOWE. ccc ccnenekaseasecccwes Cutters, Boring-Bar, Adjustable............ Cutters, Lathe, Wedge Principle for Cutters, Locking Boring Bar............... Cutting Machine for Multiple Patterns and IS ax: 5 ak gp Sosa iisnk ac eah e 'ch DNL stn hee Cutting Speed Instrument for Machine Tools Cutting Tool, Cast, Contains No Iron Cutting Tool. PeBGiL, TOP EMCO. .icccccccucs Cyclecar Goes on Land or Water........... Cylinder Pressure, Testing Engine......... Cylinders, Roundness Testing Device for. Cylindrical Parts, Grinding see ee ewe Dabney, Thomas Ewing: Sugar Mill Waste Yields Durable Building Material Dacy, George H.: Farm, Mechanical, Minimizes Hand Labor Forest NE: sn an bb cena ee Dam, Brush, for Colorado River eee etene er Dam Embankment Across Channel, Making. Dam Gates, Temporary, Made of Wood..... Dams, Temporary, Water Filled Canvas Ls cnc ciineinde uulew ene See eee eee eee eter esesesseeseseesesessees Dandelion Eradicator. Chemical Danger Signal, Grated Mirror is............ Danger Signal, Horse Fountain is.......... Dark Room, Switch Identifying in Darning, Sewing Machine for.............. Dash Thermometers, Auto, Eliminates Thiev- a Bitawvad chew sekwabkesesaeaeSadata cede Davis, Oscar C.: Tree, Giant Redwood, Moved in Upright Position Deadplates, Repairing Boiler............... Decoration, Portuguese, eo Crew CE csi sickens ace eased mad Depth Bombs, Testing Device for Derrick, World’s Highest, Lifts Piledriver and Flat Car 100 Feet...............-008- Desert, Reclaimed, Harnessing a Mad River in, by John Edwin Hogg............-+-- Desert, Sahara, Crossing by “Motor Lorries, =» © BRP Designs, Multiple, Machine Cuts Desk, Double, for Children Desk, Folding Typewriter ee ee et re er ee POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Desk, Study, Compact and Convenient..... Desk, Writing, and Sewing Machine Com- RE, Cia cura a taae sale als . Destroyer “Israel-98," Mine Laying........ Destroyer “Wickes” Won First Honors for Efficiency of Operation and “Zellin” Sec- SS EP OOP Tre Ty Te. Cre cre CT. Detecting Apparatus for Rapid Voltage Changes in Atmospheric Electricity...... Detecting Instrument for Fire Damp in OEE ere eer? Tree Tee re eee Detectives, Forest Fire, by George H. Dacy. Detector and Amplifiers, Combining........ Detectors, Crystal, French Radio Amateurs T Use Diamond Mines, South African, Air Line for. Dice, Lawn, Large Wooden........-+-+e+e8% Dickie, Francis: , Canada Takes Her Sixth Decennial Census Oil Field, Immense New, Discovered in Subartic Region of Canada............. Dictionaries, Library, Monopolized by Word- Building Contestants .......ccceececceeess Die Annealing, Steel, Asbestos Packing Ma- eS RO eer eT rere RTT Cre Te Die Holder for Lathe Tailstock Die Holder, Releasing .......ccececcccceces Dies, Branding, for Wood or Leather....... Dining Room Panels, Window Shutters as.. Diploma Awards from Franklin Institute... Directory, Motorists’, and Sign Post Com- DONE <b bse ntd decd ateeerasesoece teense v tam Directory, Telephone, Hinged for Reference. Dirigible “R-33" and Landscape Photo- OPT Tre TTT eer ere eT eT e Dirigible Victims, “ZR-2,” Naval Honors for Dirigible Wreckage, “ZR-2 in Humber River Dirigible-“ZR-2’s” Fatal Flight, by Phil W. PE, nccbnss nde e ene eeedad C4549 ESO E DOE ES Dirigibles, Giant, Mooring Masts for........ Dirigibles, Nonrigid, Mooring Masts for.... EOOGRSESS, PUSS WeOOG 2. cccoscsscecscseves Dish Drainer and Cooling Tray in One Pee Ten OP TE. ke ck wcdcnccasessves Dishwashing Device, Automatic............ Disinfector for Cleaning Clothes........... Disk, Soft Iron, Hardened Steel Cut by Disk Stropper for Safety Razors............ Disk, Vibrating, Preserves Phonograph Tones Disk Wheel Tires, Valve Extension for D'spenser, Vountain Ollcan. .....ccccscccecss Display Frame for Documents.............. Display Rack, Illuminated ee Se, Rs bos a5 28 Ken daeaden wee Display Stand, Poster and Advertising Distance Gauging of Rear Auto............ Distributor, Simplified, for Grain Elevators. Ditches, Irrigation, Cause Stupendous Loss, by Lawrence W. Pedrose............se00: Diver Dragged Over Lake Bottom on Sledge Divider Points, Hardening. .....cccseccesecs Diving Tower, Safety First, Maintains Clean EE, cae whe dbihdle & waied ees OR Ade ew Hid Divining Rod, Real, Science Gives Hope of Developing, by C. A. Briggs............+. ey Dock Fenders, Automatic, Protects Ships...- Dock Fires, Adjustable Platform for Com- RRR rare Dock, Floating, Varying Water Level Neces- (ie re ln a wey fa RIAD Docking a Giant ee Pee Docks, California, Life Rafts for............ Docks of Great Pass at Alexandria, Egypt, PPORNOR. TIOORERE Cbivcccceccccssczcsse< Document Display Frame............ceceees Dog Jumps Height-Increasing Wall......... Dog, Parachute, on Airplane with Master... Dog, Squirrel, and Bird are Fast Friends... Dogs Have Nanny-Goat for Mother......... Dogs, Russian, Pull Sleigh Over Ground.... Doll Sings or Talks without Squeezing pi ar eee Dolls, Rubber Bathtub, for Children........ Dolly for Unloading Small Cars............. Dome, Huge Steel, Forms Largest Birdcage. Door Alarm Rings When Door is Onened.... 6 Door, Bascule-Type, for Airplane Hangar... Door, Immense Hangar, Huge Roller Bear- PS ea er eee ee ore BIGOT BARGER, BOPOOMs 6 ic oc ic cscs ssisvccsseces Door Lock, Window Sash Lock as Door Locks Burglar-Proof, Simple Device Makes .

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42 10 19 396 4 o an wna nal Oo bo Oem © OWA TW=-10 www on POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Door Locks Made More Secure........... Door Locks, Timing Combination on........ TOO, Wee COD 6 5.66 ec csccccedcsvcsceses Door Signal Circuit, Night Watchman’s..... _ —e eee err Door, Storm, Screen Door Made into........ Door Strip Protects Children’s Fingers...... Doorbell Gives Two Distinct Signals........ Doors, Corncrib, Held in Place.............. Doors, Locker, Semaphore Lock for......... Doors, Screen and Wooden, Interchangeable “4 . BARRA er ee ee eee Doors, Sliding, Double Hasp for............ Doors, Spring-Operated Alarm for.......... Doughnut Cooking Machine, New Design... Dowel Holes in Patterns, Making........... Draft Indicator, Boiler, Records Variations. DOUREE, BOS TOGUNER sok ccc ccccccccccesee pS 8 re ee ee Drafting, Checking Device for.............. Drafting Eraser, Motor-Driven............. Drafting Lettering Gauge.................. Drafting—Lettering with Two Triangles.... Drafting Pricker, Serviceable............... Drafting Triangle, Facilitating The Use of. P,P BO sr sccnsacacccduscecuese Draftsmen Instrument Facilitates Work.... Draftsmen Wanted in U. S. Civil Service Draftsmen’s Flexible Curve Draftsman’s Radius Finder...........:..... Drain, Concrete, Removes Oil from Waste Water PREC ASCO V ERS OREN ORE Ch. Oae DORR OR SOS Drain Stopper, Overflow, for Laundry....... Drainer, Dish, and Cooling Tray in One..... Draining Protector for Auto Windshields... Drainings, Crankease, as Fuel.............. Drawers, Antifriction Rollers for Drawing Angular Lines, Aid for SPPOTGEE BPOAEUD COUN. 5 vc ccccacccccccccecees Drawing—Curve, Flexible, for Draftsmen... Drawing—Ellipsograph, Homemade......... i a Be Oe ee Drawing, Pen, from Photographs........... Drawing Viscous Fluids in Cold Weather. Drawings Reproduced Economically I IS a ick cg wae ak We Do ee Bd me Dredge, Immense Suction, Sinks in Oregon Cs sia ate dinds baleiki se cman ou Shek ok hoe Dredging Project, Immense, of Newark Bay. Dredging The Great Pass at Alexandria, RE ees rane Dressing Booths Along Red River, he dei Gaia nck a Se ke ald ee eRe rica a eee Dressing Table, Writing Desk, and Library OR SR eee aa Drier, Fruit and Vepetable....ccccassscsses Drift Testing Device for Farm Implements. cn TD, oc nae ace renee ek aneeewes Drill, Electric, Made from Old Auto Starter. Oe eer nee Drill Holder and Reamer, Self-Centering. Drill Holder, Turret Lathe..............0.- Drill Mounted on Air Cylinder.............. Drill Press Centers, Instrument Tests....... & . . Sar eB Ee paren Drilling, Flexible Shaft for...............00. Drilling, Lock-Joint Device for............. Drilling Long Holes Axially Parallel........ Drilling Machine Bolted to Ceiling Drilling Machine. Portable..........cccsse- Drilling on The Milling Machine........... Drilling, Well, to Drain Land, ey ee ee a tg re iaiitg ate a eels wate Wa beak en Drilling without a Drill Chuck.............. Drills, Air-Driven, Blaze National Forest ae oa cual Gh 5 ica ca ao oe oS wee we 8 Drills Made from Needles................... Drills, Twist, Sharpening and Thinning Ma- chine for Drinking Fountain, Horse. is Danger Signal 2 Drinking Glass, Sanitary Cover for......... ——s Water Near Tidal Rivers, Purify- eer os Les Gu sakGe Ger ae ee en ee Drip Pans, Oil, Helmets Used PR iii naiee as as Drive, Inclined, Depressions Aid Auto on. Drive Pine, Broken, Removing............. Driver, Homemade Post.......cccccccccsecs SPUOMENE, TEISSCOMINE 2... ccc ccccccceccccees Drug, Antifebrile, Found in India.......... Drugs and Serums, Commercial Production Drum, Bass, Carries Snare Drum and Traps. Drum, Hartford Veterans’, Requires Four fg SR ere -~J-1-10-+) ~~ Ole co OO -1-109 “100 Color oo wOonmOrCV-142W 0! ee Rod neaoo toe Oo 310 ” 759 _ oe es Drum Pedal Operates Snares and Cymbals.. Dry Cells, Spring Connectors for........... Dry Rot under Linoleum, Preventing........ Drydock, Modern Marine, for Manila Port.. Drydock to Accommodate Largest Vessel Dt anh o64c6006KE 400 o20b506000s006 60608 Drying, China Clay, New Method for........ Drying Fish, Fruit, and Vegetables by Con- veying Apparatus ...... eee ee eeeresesencs Dummy Feet, Simple Appliance Adjusts.... Dummy Protects Jackie Coogan’s Eyes...... Dump Car, Air, with Extension Side......... Dump Wagon Sideboards, Lever System Lifts 9 Dumper, Motor-Truck, Runs on Rails...... Dunn, Harry H.: Bridge, Tube, and Mole Combined Planned to Cross San Francisco Bay............ Packét Comes Back, The. ......cecsescescs Duralumin, Airplane, Subject to Crystalliza- ERR eee err ERO TTT eeT Ue Duralumin Motorboats, Germans Make...... Dust Pan that Holds The Dirt.............. Dust Precipitator, Electric.............+++:. Dye, Strong, Underground Streams Traced reer Pre Tee LeU. Dye Works Explosion, Oppau, Ruins of..... Dye, Yellow, Makes Wool Moth-Proof...... Dynamo, Small, is Power for Bicycle Lamp. Ear, Sow’s, Silk Purse Made from..........- Ears, External, Grafted on Infant........... Earth May Leave The Sun, by C. A. Briggs.. Earth Pressure Limits Depth of Mines, by Ch BP caccevecsepaccecsseacneceses Earthquakes, Building to Withstand........ Earthquakes Recorded Photographically.... Economical Suggestion, Prize Awarded Navy Pt i sn. -s wna eee eb ake ra sen eabkwsan Edison Phonograph Phrases, Prizes for... Efficiency Information, Industrial, aes * dns es Was SOR She bbe Khe beh ene Eeggbeater, Electric, with Detachable Motor Egg Laying Hens, Device Spots... > Ege Scale Grades Eggs into Three Classes. Ege Sterilizing and Sealing by Machine... Eisteddfods, Annual, Welsh Presbyterians of Philadelphia DR ee iad dhe arn nie on Ejector, Automatic, for Hollow Punch.. Election Ballots Counted with Tabuls iting PED neces cw ucnecsecensseseevesesonse Electric Alarm Rings When Door Opens.... Electric Announcer Names Stations......... Electric Automobile, Small............++56. Electric Baby Incubator..........cseeseeee% Electric Bag Tying Machine........... Electric Bulb, Three Wire, Gives Triple OPTED nokcctevereaenaceeneeaes Electric Bulbs Displace Radiator Cap ‘Knobs Electric Bulbs, Machine for Purification of COE: TR nds cnvesceresstecedscqenrnecnes Electric Candlestick ............+. Electric Centrifugal Wringer for Clothes... Electric Current, One Million Volt, Trans- mitted Successfully ..cccccvccccccsscvces Flectric Drill Made from Old Auto Starter.. Electric Egg Beater with Detachable Motor Flectric Fan Attachment Increases Humidity Electric Fan Design, Aeronautics Affect, by CE DO bo ve 0c. 600 br K6n'0 060s setoede Electric Furnace for Small Steel Castings... Electric Furnace for Stamping Plant........ Electric Furnace, Striking Results of, by C. Rs ccadoc cadet ceaaa ves seaercannesde Flectric Heater, Adjustable....... Electric Heater Fits in Bathroom W all Electric Heater for Auto Also Heats Coffee. Electric Heater for Light Melting.........- Electric Heater to Gas, Converting......... Electric Heater, Two-Position . - Electric Insulators Made from Met: allic ‘Mag- re eer ry srr Electric Iron as Arc Rheostat........60+0065 BEs@CtTaS TFOM, BEAR COP... cccccscrvccvscssece Flectric Lamp and Fan Combine ' eebege: Electric Lamp, “Baby Vamp” Electric Lamp Bracket, Adiust: ible Compact Flectric Lamp Filaments, Machine Winds... Electric Lamp, Perfume Burning... Electric Lamp with Cable Reel for Garages Electric Lamps, Detachable. Electric Lamns, Miniature Tipless, Se aled by wl Eee Electric Lantern Shows Red and “White eC TOT CETTE TTTTeerrTT eee

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16 Electric Light and Power for Philippine errr rT rT eT er heat e am 96 Electric Light Bulb, Burned-Out, Makes Bess Pie TOmtel. . os vcveccccccdsecvsecs 144 Electric Light Bulbs, Handy Rack for Dis- CE escctastavdean kee aoe. otnn ae Se awsce ae 71 Electric Light Cord, Spool Adjuster for..... 311 Electric Light Fixture, Largest Indirect.... 18 Electric Light Fixture, Trench Helmet..... 957 Electric Light, Semi-Indirect, Totally En- BNGOE ccvesvecece OE I ree 248 Electric Light Sets, Christmas Tree, Now Obtainable in Single Units............... 538 Electric Lighting Plant for Sled............ 944 Electric Lights for Motorboat.............. 476 Electric Lights, Wire Wastebaskets Protect. 797 Electric Meat Chopper, Improved........... 702 Electric Motor Pencil Sharpener............ 417 Electric Motor to Sewing Machine, Attach- Se ben eae tous aad lia iclacle.de es a Re a a Gk 318 Electric Ovens for Picnic Park.............- 429 Electric Phonograph Motor, Noiseless....... 48 Electric Plug, Easily Repaired............. 116 Electric Power Production by Public Utility ee SOO eee 168 Electric Railroad, Jugoslavia Government |] Eee Te er er Te 650 Electric Sedan for Invalids and Shoppers... 421 Electric Shoe-Shining Machine.............. 374 Electric Sign, Brilliant, Has Few Lights..... 828 Electric Sign Marks Aerodrome at Croydon, DE 6 os Rese AER AERD CeO e488 COR 830 Electric Silverplating Method, New......... 647 Electric Soldering Outfit, Low Tension...... 940 Electric Sound Amplifier Uses Rigid Paper I RR LPO PE ae rT ert 894 Electric Steam Engine, Toy................ 857 Electric Steel Tubing Made by New Process. 526 Electric Stove for TravelerS............ee60:. 915 Electric Switch, Fool-Proof................. 540 Electric Thawing of Frozen Pipes.......... 766 Electric Toaster, How to Make............. 303 Electric Toothbrush for Home Use.......... 365 Electric Torch for Industrial Uses.......... 228 MIOStFiC TOURS? POSS... ccccccscecssccece 338 Electric Utensils, Multiple Connections for.. 795 Electric Vaporizer Makes Auto Starting a — trapebneeeue peeeweeee Pere Pe See BUN, 6 ccccendéhenbehane doen ea 273 Electric Warming Plate.......... er eae 915 Electric Washing Machine, Small........... 180 Electric Wire in River Kills Fish and Frogs 201 Electric Wires, Temporary, Portable Rack I “oh 5 aGc6 dane eae be atk oe eu ene 896 Electrical Apparatus, Bugs and Plants Inter- 2 ae errr 738 Electrical Development, Holland Pushes.... 702 Electrical Moving Road Proposed in Japan. 849 Electrical Precipitator Takes Dust from EN let Bo ee bis morales wa eal he law ced eet 7 Electrical Supply of London................ 654 Electrically Driven Sawmill................ 249 ar~ wowed Welded Joints, Tensile Strength PE Suet RPAtR a OCONEE UES SDERD SCARS 64 doe ae” 60 243 Electricity, Atmospheric, Detecting Appar- atus for Ranid Voltage Changes in....... 691 Electricity Destrovs Pine-Bark Beetle...... 68 Elephant Fossil, Giant, Found in Texas..... 240 Elephant Statues are Business Man’s Hobby 267 Elevator, Australian Grain, of American De- SE Mie hirdtig ihe Weak d amare cae Pee Kaeee es ee 904 Elevator, Chain-Cup Grain, of New Design... 358 Elevator, Grain, Simplified Distributor for. 693 Elevator Planned for Alpine Summit........ 335 Elevator,- Wrecked, Grain in, Pneumatically ais a ie dias ak dap is aaa a eh aoe ani oon a 374 Elliott, A. B.: Snagging Deadheads in a Lake 813 Ellipsograph, Homemade ..............s05. 455 Embankment Making Across Open Channel. 688 Embossed Printing, Imitation.............. 293 Embosser, Stationery, How to Make........ 464 Emery Cloth, Handy Mounting for.......... 138 Emery Dust from Lathe, Catching......... 285 Endowment of Money and Land to Alla Dis- trict of Collin County, Texas............. 109 Energy Yields but Little Matter, by C. A. IE lie ica tem ie dekh a widen ein bs: Ae wie de 602 Engine, Auto, Made More Efficient by Cool- §. SO Rar aaa 384 Engine Base, Old, Saw Frame Made from... 477 Engine, Bicycle, Front Wheel Drive........ 22 Engine Carbon Removing with Spiral Spring 474 Engine Crankcase, Radiating Flanges for.. 277 Engine Crankshafts, Truck for Handling... 618

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Engine Cylinder Pressure, Testing......... Engine Cylinders, Roundness Testing Device eer e cee e es eeeesesreeseeesesesreseeeeeeees coal Engine Flywheel is Also Radiator.......... Engine, French Bicycle, is Smallest Made.. Engine, Gas, Auxiliary Air Device for....... Engine—Intake-Pipe Fitment Saves Gas.... Engine, Old Fire, Used for Road Building... Engine, Old Gas, High-Tension Ignition for. Engine, Multiple Drive, for Seaplane........ Engine, Multiple Unit, for French Airplane. Engine Power Plant, Portable...........+.- Engine, Powerful Airplane, Built by Govern- eee er ers erereeeesseseseseseseeseseseeeere CORPO PE eT Tee COT Te Te LT, Engine, Steam, Toy Electric..............+- Engine Stopped When Fan Belt Breaks..... Engine Thermostat, Auto, Saves Gasoline... Engine, Toy Sand Engine Water Jacket, Gas, Cleaning........ Engineer, Civil, Poem of, by Lydia M. D. EE hbcetde kodak nas oudet week eeteee teens Engineers, Assistant Mechanical, U. S. Civil ON WEOS. COED nos 606005 645 4200 cb eecesceee Engineers Wanted in U. S. Civil Service..... Engraving Machine Make Music Printing Pree eer r rT Tere rrr err rr Enlarging Wet Negatives................-- Envelope Has Perforated Safety Flap....... Envelope Machine Inserts Two Inclosures.. Envelope Stamping and Sealing Machine.... Equilibrium Device for High Rotating i FOR Tee re TT Pe TTT LPL ETS Eradicator, Chemical Dandelion............ PEPREOT, SRM, TWAS POR BBs cxccsccccviscecs Eraser, Motor Driven, for Draftsmen....... Eraser Using on Tracing Cloth............. Eskimo Census, Sixth Decennial, Canada Tames, By Prancis Dickte....-ccccscecscer Essay Contest on Good Roads Open to High Pe EE ccc esaci chided een wena dense Essay Prize on Contributions of Jews to ER rr Seer eee Essays, American History, Prizes Offered... Essays by Enlisted Men, Prizes for......... or Cruelty of Trapping, Prizes Offered __ Rr a a ete are ee eae Essays, Heredity, Essays, Safety First, School Children Offered oo 8. eee ee eee Estate Management Course, London Univer- 2 ye _. Reena errr rrr Evaporation Forced at Potash Ponds........ Examination, U. S. Civil Service, for Survey Co, eS ear rer ae ar Excavation Sheeting, Plate-Steel, Pulled into eee eee seers sees eseseeseres a BO ee ere Excavator, Endless Tread Steam, Fords DE ccacecata rina iw aed ees hoa dee be aonb Excavator, Endless Tread, Turns in Its Own EE. eShlale to +O 'a0.0 Gin sd aa ee wo ho ow ko Execution, Humane, by H. H. Windsor...... Exercise, Swimming, for Crippled War Vet- EE catia Mana sek aa oree hh hs Mk Whi ese wa Exercising, Self Resisting Device for....... Expedition, Antarctic, Now under Way..... Exploration Trip, Airplane, of Oil-Killed Vegetation in Orinoco Delta.............. Explosion, Airplane-Bomb, Loose Firing Pin SE <shcb wen auw a ceeee bs. 0o Whe dhs Wee dae e Explosion, Oil Tank, Fractures Chain...... Explosion, Oppau Dye Works, Ruins of..... Explosion Wrecks Four-Story Building.... Explosions—Bomb, World’s Largest, Makes oS og 508 San avis wo sn Wb ow be ee a Explosives Used to Expand Bolts........... Exposition, Mexico, to Promote Trade with i Cod veseah bison epee rans «eee Extinguisher, New Fire, Subdues Twelve aihett awe a eke ra he Raven oe Wade eé dae ee Extinguishers, Chemical, Unsafe for Mine EE Sia CA wok is ne aca hee bal eee 0 6 we eee eee Eye Strain, Cause of, in Movie Theaters..... Eye Vision, Center of, Not Always Sensitive i: Ci Ee Wes Ms cee racusesceinrs Fabric Airplane Propeller, Molded, is Warp- Proof ..... I EEE rrr rr er ee Fabric Made from “Kapok” Tree Cotton.... 641 206 426 826 838 46 640 565 434 495 602

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wVwoome sa ACH On aon eS —S ~ ~) J~) PE) ee POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Fase Mask and Fan Combination is London Se eeeesreeseseereseseses Face, Singers’, ‘Tiluminatea with Bouquet ——_ (mune eee weCRtaenekn cocese 263 Facing Bar, ‘Adjustable eT OTT Tre 124 —s . Communication, Wireless "Stations 213 LE EP Pe ea any eae 1 Factory Machines, Instrument Records Stop- Ct i cneivened ene Gdiawssaduaeae veseeos 194 Factory Waste, Grape- Juice, Utilizing...... 195 Fad, London, Fan and Face Mask Combina- CO Ee bk keen wed ntveseenadececanaas 86 Fan Attachment, seeteta, Increases Humid- os3 it theese Cad Ackaenee shone 606 a6 Fan Beit, Breaking, “Stops pS TTT TT 134 Pa, ERNEROe, and Face Mask is London 86 Fan Design, Electric, Aeronautics Effect, by i CE ininca ced wees ReAiheseeneee 884 Fan, Electric, and Lamp Combined......... 273 Fan, Emergency, Mine Fire Fighting with... 687 Farm, Game, World’s Only Convict-Oper- ated, by Lawrence William Pedrese...... 547 Farm Implement Drift Testing Device...... 897 Farm Sign for Selling Chickens............ 456 Farmers’ Wife Reunion is Pleasantly Profit- St. cca cee ede evnanecee keds ces thee Cee cin os 595 Farming, | Mechanical, Minimizes Hand La- a} 2 G & ~~ AAR 80 Fastener, Adjustable, for Tennis Nets...... 307 Fat People Not Allowed in Sequoia Park Gt Sein cheddar ae tua ddaee bane ena s were 661 Fatigue, Degree of, Japanese Device for DE Siateccretkinapiceesesonewe dann 874 Faucet Atenshenent: NE Sree Tr eee 634 Faucet Attachment Mixes Hot and Cold Wa- eae Or wecae koe Seveceeeeecoteseveowtesaenes tine 757 PRUBOSE, TOMOTHORSY 2c cccccccceceweeseucsese 125 Feather Importation Barred by Great Brit- GE aden e cons 6656066804400 s 604s ON ETO ELO 4 Oe 484 Feathered Armlet is Parisian Conception... 752 Feathered Shoes is Latest Parisian Style... 187 Feed Grinder, Auto Magnet Protects........ 462 Fence Building, Old Pipe Aids.............. 317 Fence Gate Made without Cutting Wires... 318 Fence for Wild Horses. .....cscccscescsececses 339 Fence Posts Made of Tufa Rock............ 834 Fenders, Dock, Automatic, Protects Ships... 111 Ferrotyping Glossy Prints................. 150 Ferry Carries Autos Over Lake Ponchar- PE GS Red cece nenadhs cae ceaees HO One 5 E.5 Se 420 Ferryboat Swimming Pool in Playground... 19 Ferryboat, Toy, Runs on The Floor........ 857 Fertilizer Distributor, Homemade........... 125 Fever Cure—Antifebrile Drug Found in In- CE RELA NES Re Ae b OOH R ds eee EE CREO eS eke es 390 Fiber, * ‘Kapok,” Made into Cloth........... 263 Fiber, Pineapple, Machine for Separating.... 210 — Markers for eeeineneite in Western For- oss Ce acd tae idee andthe eSb aw aneaeeuenwsees Filaments, Electric Lamp, “Machine Winds.. 686 ee Cabinet, Steel Fool-Proof, for The m ON os odode ee ide Seis O0dew Ses seine ee Ee ate nn den th ones eean ewes 141 Filing Marker Shows Place of Withdrawn DU? Divi ehuennacnscceaethvadoeecndue es 558 Filler, Paste, for Hardwood Fioors aia aie me 448 +o Rubber, Made of Pulverized Tufa 934 Filling Station, Pneumatic, and Storage Sys- tom fOr Gasoline ...ccrccscccsscccccccecs 43 Film Device Eliminates Rewinding......... 732 Film, Motion Picture, to Explain Einstein Theory PPT OTTO e eee eT TTC LOTT eT 901 Film Spools, Candlesticks Made ae 951 Film Spools, Resistance Units Made from. 797 Film Spools, Ticket Holders Made from..... 153 Films, Cut, Developing opines eee 473 Filter, Charcoal NS 6 6 ctbedatniednvense 755 Filter Sl ME, ciuwccckeaesicaeereoes 91 Filter, Gasoline, for Auto Vacuum Tank. 596 Finger Prints Amplified by X-Ray Photog- SE Shans heb ebecddudehedesevucese 436 Fire Alarm Box. Piset, OF BOStOR...ccseccese 109 Fire Damp Detecting Instrument for Mines. 745 Fire Destreys Statuary Models............. 270 Fire Detectives, Forest, by Geo. H. Dacy... 311 Fire Engine, Old, Used for Road Building... 235 Fire Extinguishers, New, Subdues Twelve PO MMe. pv adbinekw es cas ikiedoaen 565 Ty Extinguisher Shoots Twelve Streams-eof aa Fire Fighting. High-Power Searchlights Aid 536 Fire Horses Honored in Los Angeles........ 895 17 Fire Hydrants, Force Increasing............ 268 Fire Hydrants, Protected, of Long Beach, cite enc euehatn kena tos ees ee 109 Fire Pot Hot-Loop, Plummer's............. 772 Fire, Stubborn, Subdued with Baking Soda... 412 Fire Trucks for Forest Fires.............. 664 Firecracker Cannon, Breach-Loading....... 150 Fireman Found and Maintain City Park, by i cs «hina tanh dihn ws ee bade as ae aewes 86 se - Dock, Adjustable Platform for Com- . i conch eee ad Saha eee ek oh eee eee 7 pa "ites, Chemical Extinguishers Unsafe . PAARRSKUERSROUETN SPREE DOS6005%k0 eee Cheese 484 Firing Pin, Loose, Causes Airplane-Bomb Explosion Ae e eek Dees bs) dee es oe eee ke 206 Fish Avoid Electrified Curtain.............. 40 Fish Delivered to Madrid, Spain via Airplane 377 - tape by Heated-Air Conveying Appar- aa3 Fish” Dustin: “Chef” of Miami Equarium is DG GE ncccccuénsanndseeesusweeseseseae 91 et - Hatchery Pools Protected by Small ses 4 2. Kilied by Electric Wire Falling into 202 Fish Leon, Enormous, Caused by Irrigation Ditches, by Lawrence W. Pedrose........- 257 Fish Scales, Pearls Made from............+. 64 Fish Tails for Hat Trim. ....cccccocsscccece 493 Fishing and Amusement Piers Side by Side.. 568 Fishing, Ice, Portable Shack for............ 943 Fishing Rod Support Aids Fisherman. 189 Fishing Rod Tip, Removable Roller for. 695 Fishing—Tackle Box, Tobacco-Tin......... 308 Fixture, Detachable Lamp...........-s05+. 241 Fixture— Lamp Bracket, Adjustable Com- EE. 6p s0 56505 seeds eee Chae ess ELDON E CORE 274 Fixture, Lighting, Largest Indirect......... 18 Fixtures, Multiple-Reflector, Brightens Coun- CO BOD wee caenecdceckeikeeta450¢s00%E0.8% 39 Fixture, Semi-Indirect Light, Totally En- SEE acess sds egetacsadbhedaendbn0e6ed ess 248 vie. Hand-Embroidered, for President Hard- - Sl Chast en SA KAAR ED ENE RTAAO ARON LES © ON W . Flagship Policy, New, U. S. Navy Adopts.... 838 Flanges, Radiating, for Automobile Crank- GEES ae dcrens scene cusGeaasedencadvevecdes 277 Flash Lamp, Photographers Folding Por- table, Controls Angle of Light............ 77 Flashlight, Improved Generating........... 706 Flashlight Put to Odd UseS...........e.0.. 618 Flashlight Reflects Beam 300 Feet......... 424 Flatiron Stand Fits in End of Ironing Board 914 Flax Scutcher, Mechanical............+ee8. 208 Flier, Stunt, Miraculously Escapes Death... 357 Flier, Stunt, Original and Daring.......... 376 PIORE, TUIPTOVOR TEER. ccssccccccascescecees 302 WEOOE TOROe, PONG s ccc cnccsvcrccvescecs 216 Flood, Floating Oil During, Sets River Afire 839 Flood, Pueblo’s, Wrecking and Salvaging PEOEO. RUOE Adbsdnaewedenccsenesececscses 505 Flood Water Damage, Hydraulic Jump Pre- TOG: TT We Ses ce esesccscconces 709 Floor Brush, Spring Handle................ 433 PICCF PIniSRing, COmMCTOte. .ccccsccccccceces 769 Floor Laying, Device AidS..........cceceees 131 Pe Ms dea ubecdesaeeeernbcceene 468 Pe Cn, Cc ckkad et aebs aes Se keeee.oe 950 Floor Waxer Eliminates Stooping.......... 577 er er ee caw adda ewes oo ssaee soe 300 Flooring Clamp, Improved............+...+. 769 PROOTS, CORGTOCS POOGIME. oo ccccccccccccsses 935 Floors, Hardwood, Paste Filler for......... 448 PeOees, COR, Weel. ccccvcecoscceces 284 Floral Gift to Mrs. Harding Made of Rye GRA eae 81 Flour Sack Tying Machine, Electric........ 349 Flower Baskets Made from Steel Trench SEE Goaeeeeuvarwac pe eiswes ck ceenscwa 151 Flower Holder for Shallow Dish............ 593 Flower Stand, Adjustable..............e00. 272 Flowerpot for Colored Wooden Flowers..... 280 Flowerpots, Small Heater Made from....... 958 Flowers Preserved in Silk Bag............ 96 Fluids, Drawing Viscous, in Cold Weather... 937 Flume Built Along Columbia River Cliffs. 871 Fly Eradicator, Science Uses Parasite as. 564 Fly Swatter and Brush Combined........... 153 WEY BOO, TOCRTIRE BEEPS cc ccccccccccccces 434 Flying Machine Wings, Rotary, by Henry S. TT co Nenees cGelak Wd eed been en eee se) 15 Flypaper Device Renews Sticky Surface. 918 Flytrap Built by Fifteen Year Old Boy..... 648 Flywheel Radiator for Engine............. 368

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18 Flywheel Ring Gear. Changeable........... 569 Fodder, Blowtorch Converts Cactus into.... 186 Fog Code Signal System for Ships.......... 596 Fog Horns, Efficiency of, by C. A. Briggs... 602 Fog Signal, Auxiliary, for "Railroads Fae waa 860 a -*- oe Strange, of Ants, by C. A. one Football Players, Bucking Strap Trains. 846 Footstool, Comfortable ......... iwehenweess 305 Ford, John Anson: Gases, Motor Car, in Tunnel Create Prob- Freer re ree ee 393 Home, Beautiful Californian, without WEE OF TOOT ccc scacncececvecedccse Stadium, Pasadena, to Be One of World’s BGR cS cee ee iW eed bee eneseeneeet te e6s 696 Forest Fire Detectives, by George H. Dacy.. 211 Forest Fire Truck... .....cccscccccscccccsves 664 Forest Guide Posts for Tourists............ 711 Forest Product Laboratory for Australia. 642 Forest Products Laboratory Gives Crating and Boxing Course........cceeccesseereee 959 Forest—Redwood Giants, Largest of, Pre- : served in Sequoia Park.........-++seeeee 56 Forest Roads, Natural, Blazed with Air- po i. errrrrrer rr rrr rere ree ee 383 Forestry—Crossbreeding Trees to Strengthen Species, by Harry A. Mount.............. Forests, Western, Airplane Field Marker for 233 Forge, Small, Made from Ojilcan............ Forge, Smithing, for Various Operations.. bit Fork, Knife. and Spoon Combination........ 914 Forms, Collapsible Steel, for Gigantic Sewer 842 Fort, Steel- Walled, Manchurian Governor's Auto is, by Geo. F. Paul............2556- Fossil, Animal, of Prehistoric Age Found... 691 Fossil, Giant Elephant, Found in Texas..... 240 Fossil, Prehistoric Reptile, Found in Canada 92 Fossils, Animal, Found Along Red Deer BUNUN, BEMOEEE, cccccscwaddcceececcscivecnss 887 Foundrymen, Hip-Length Canvas Leggings PEE cheba chAREASS OL ONS SeOheR wees Oe Sa OO 8 Fountain Brush Has Fafety Fuse.......... 256 Fountain, Horse, is Danger Signal......... 269 Fountain Model by Students of Art Institute 800 Fountain Oilcan Dispenser................. 241 Fountain Pen as Stamp Moistener.......... 624 Fountain Pen Cleaning...........0.eeeeeeee 945 Fountain Pen, Pump-Action............-++:5 270 Fountain Washbowl, Sanitary Economical.. 862 Frame, Display, for Documents............ 317 Frame, Hack Saw, for Shallow Cuts........ 454 Frames, Double Sash Window, with Screens Dt A Ps nh cdetaartae state sedneee as 665 Franklin Institute Awards, Diplomas, Medals PE CEE ccchecrencteghenseanesgeeaeneease 319 Freezer, Ice-Cream, Instantaneous Action.. 520 Freight Car, Hand Lever Brake for......... 382 Freight Cars, Rachet Hand-Brakes for..... 880 Freight Cars, Steel, Wood Planks Displace Pe ED Gs cn caveceevusevnssaassceees 238 Freight Containers, Steel, for Railroads..... 31 Freight Handling in Oriental Seaports...... 741 Freight Rates, Truck, Nebraska Repeals.. 164 Freight Shipping, Reinforced Collapsible "Fee a gan Sp ae 35 Freight Wreck, Eighteen Cars Piled Up in.. 839 Fret-Saw Work, ee PO rey 631 Frog, Toy, that Ea re 281 Prope Killed by Electric Wire Falling into NE ich ca eb ie dasa ah athe heh eed ae mole ik 201 Fruits and Vegetable Drier................ 953 Fruit — Blackberry, Giant, Discovered in i P46 dow e606 ee me week ee eee don 223 Fruit Dried by Heated Air-Conveying Ap- EE 23 0.66 aCe hee Bek ea a a eee 422 Fruit Exposition, Northwest, Offers Prizes.. 800 Fruit—Lemons, Monster ............0....0¢ 247 Fruit Preserved in Fresh State for Months.. 757 Fruit—Prunes Treated by New Apparatus.. 358 Fruit Ships, Forced Air Ventilation for..... 332 Fruit Stand, Self Service................... 284 Fuel, Crankcase Drainings as.............. 124 Fuel Economy, Airplane Sets Record for. 530 Fuel Oil Viscosity Tested by New Instru- SE nus bie wha 6 Cte © wos 5.860 OR hie wilnsd 00 a4 b-0o dese 62 Fuel, Ship’s, Cost Less Than Nothing....... 224 Fuel, Unburned Furnace, Recovery of...... 900 Funeral Services for “ZR-2” Balloon Victims 663 Funnel, Automobile Radiator............... 782 Fur Trader Trail, Tablet Marks............. 429 Furnace, Electric, for Small Steel eee.» 889 Furnace, Electric, for Stamping Plant...... 695 Furnace Fuel, Unburned, Recovery of a tine wien 900 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Furnace Grate Ash Sifter................08. 751 Furnace Heat, Waste, Utilized in Boilers... 190 Furnace, Largest Crucible.................. 57 Furnace, Revolutionary Form of, Gives Striking Results, by C. A. Briggs........ 762 Furnace, Tinners, Gas Iron aS.............. 451 Furniture, Brazilian Woods Tested for PE Kadkbae debs eead ee het edeenu ceases 381 Furniture: Armchair, Collapsible, for Tourists....... 741 = ane Stand Combination Houses Tele- a chain. Kitchen, Has Manifold Uses....... 752 Cots, ‘Three, Made from Two..........---: 311 Couch, Steel Sanitary, with Adjustable Oe arr earrr eee ee 272 Desk, Double Writing, for Children....... 313 Desk, Writing, Dressing and Library PD. ON SO cb ecccredecsscevicesreuses 113 Footstool, Comfortable .........-..eee08. 305 Garden Furniture, Combination........... 74 Garden Furniture, Concrete— Part III PUBCOP DEOIGS ccccccccccscccvccesceuess 147 Garden Furniture, Concrete—Part IV GN TOO 6 oo 6 o.6sc eceeestsederes essence 309 Garden Furniture, Concrete—Part V Orna- CRE FD o.6'4.06. 6 060k ss ben eeivesse 469 Garden Furniture Made in Mud Molds.... 647 — Chair, Baby Jumper, and Go-Cart in SA na cc he ph eee thse Ohne eae eee eee e® 920 Kitchen Nook, How to Make Equipment ons De icthday Cidéatisiasda ante hs een owe 7 Phonograph in Central Panel of Cabinet.. 593 Sewing Machine and Writing Desk Com- SE £5 a St sae week oe neeehe ketene news tee 272 Table, Convertible Top........cccccsccees 316 Table, Extension, for Kitchen............. 945 Table Made from Spruce Log............+. 811 Table with Folding Top................. 593 Teacart Equipped with Stove............. 757 Fuse, Audion-Bulb, for Wireless........... 35 MURS PIG, BRPIIGs occ cccmecscesvecctioceces 278 Fuse, Renewable, Has Auxiliary Coil....... 405 Fuse, Three Element, Triple Capacity...... 570 Gallery of Art, National, Smithsonian Insti- > CESOR CD PUOUNIOD.s os ce ccccdecessvesececogns Galvanizing Kettles, Exhausting Fumesfrom 297 Game Farm, Convict-Operated, World’s Only, by Lawrence William Pedrose............ 547 Games: Basket Ball Scores Announced by Bell CO PT errr rere rr or rrr 276 Checkerboard Has Attached Playing Coun- _; Peerererrrvrerrrerereererrrirerrerre 7 Chess Set Made of Aluminum............ 498 CONGOE, BUGGED cc cccescccsodacesesscovsnse 945 Golf Course, Toy, in Box........c..eeeee0- 281 ,. i} . — RRR rer er re 207 Gangplank, Overhead, for Viewing Truck DT 63660 Gbb00440.64660004008 404000008105 48 GeseGe WOOT, WOVE). 2c ccccccccccccocesccccs 634 Garage Gasoline Measuring and Storage BFSCOM, PROCUMBCS 2c cccccccccccccsccsecs 4 Garage Gives Auto Repair Insurance....... Garage Has Elevators and Conveyors....... Garage Inspection Work, Electric Lamp for Garage, Private, Grease Bucket and Pump Me Sta reew sos neues eb ene Obes nakeeea ethene 68 Garage Wash Rack, Lighting System for... 206 Garages, Community, Duluth Adopts....... 745 Garbage Receiver for Kitchen.............. 272 Garbage Truck for Detroit................. 235 Garden Furniture, Combination............ 74 Garden Furniture, Concrete—Part III Plas- et EE Bald obdnb sos he 6 Cbs bee ona ee'bo 147 Garden Furniture, Concrete—Part IV Glue PE: Hath ehsteee hs exdess dich sesawea nd be 309 Garden Furniture, Concrete—Part V Orna- EE nace es ones eediad oneedeswnee 469 Garden Hose, Reeling.............-ceceeeee 305 Garden Pattern Marker, Compasslike....... 913 Garden Pergola, Building Re tatdn ene eees «+. 463 Garden Planting Time, Clock Tells......... 208 Garden Rake, Sectional, May Be Widened.. 184 Garden Seat Made of Sea Shells............ 409 Garden Walk, Ornamental, Made of Concrete ithe eeaeuadisGt and es.668% 260s wee 239 Garden Weeder, Homemade................ 153 Gas, Auto, in Tunnel Creates Problem, by John Anson Ford........-ccccccccccccccs 393 Gas Burners, Open Flame, Wasteful........ 794 oe A —-aas and Steam Road Rollers Stage 9s oun Exhaust, Makes Wood into Charcoal. 384 SOO OF BAADH AHAHAA fH A AABAA OO QHOOOH OO OH QQ RQQAQAAMA AMAQQAN OAQQQQQNfAAnAHA 000 QA

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POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Gas Iron as Tinner’s Furnace............+.. Gas Made from Straw by New Plant Gas, Natural, for New Orleans............. Gas, Noninflammable Helium, Airship to Be errr errr ree Gas Poison in Mines, Experiments and Pre- vention of ‘ Gas Producer, PEE. carga eadeset itech ed ckeRadeade ces Gas, Producer, on Auto Truck Reduces Cost Cee De, A BOP i caccacccsoss ws isvisnce Gas Tanks, Roller Truck for Gas, Tear, Matrices’ POMCOMON. 2... <ccscrccss Gas Turbine Development Remains Experi- mental Ge es Ne oo iv sae iceae Saws ee Gasoline, Auto Engine Thermostat Saves... Gasoline Lines, Auto, Cleaning............. Gasoline Made‘from Fuel Oil by New Im- SE, baci baee sane ns SUCRE OOD EKO O88 Gasoline Measuring and Storage I a ee do rea acai Ww cdo we Gepeeee Teme, POPGRRIRs « .26ccsccccscscrcce Gasoline Saver for Light Cars............. Gasoline Supply, Largest, on Record........ Gasoline Tank, Seven Ton, Floated into Ce sae a wane eG Ode dae a aka ae oe Gasoline Tanks Destroyed by WRCOUEE TCP Ueee THOME. 6 5c ck cc cccccvcvece Gasoline Trucks, Dragging Chains Protect Gate, Concrete Head, Controls Water of Im- .. 385.. 2 ara er ee Gate, Fence, without Cutting Wires........ ee eS a Oe eee Gates, Temporary Wood, for Irrigation Dam Gauge, Adjustable Snap, Measures Thread GS re ha Gaia wh bare oe Kae o-5.0 2 wee in Gauge Attachment, Surface, for Square.... Gauge, Auto Engine Oil, Signals Shortage Gauge, Boiler Water, Automatic Safety RR a hela... Gk ill Gaia wis MnO aia we a d'e a Gauge, Draftsmen’'s Lettering ............. Gauge for End Cutting Pliers.............. Gauge for Internal Shoulders Gauge Glasses Break, Why rn i as apedssdueriw aban Gauge Holder, Radius Gauge, Lathe Center ee i be kia dna dde oe wewe 6.6 b:8 Game, Gls, TOF BORTINGS:. ...cccccccceecseces Gauge, Pressure, Calibrating............... Gauge, Self Acting, Records Contents of Oil DE ect eee ae eaa sei sas 6K wee beste 6 Gauge, Shaft Centering Gauge, Simple Taper Gauge, Thread er ee ee ee Gauge, Tire. Tells Pressure While Inflating 2 Gear Calculations, Triple-Disk Sliderule for 2 Gear Mounting, Planetary..............0++.. Gear Shift, Automobile, Located on Steering .. iShares pete Gear Teeth in Multiple, Shaper Cuts ..., freee Geese, Snow, Protected........ccscccccccces Gelignite Shatters Lofty Smokestack Gem Coloring with Radium................. Generating Plant, Transportable Light Generator, Largest German, Unusual Pro- re ae Generator Testing Outfit Geology—Sea Level, Change in, by C. A. ae Did cis i ape iu Wee G'S kaa eae a cs eee Germinating and Testing Device for Seeds. Gift of Money and Land to Alla District of Ci Cee. Tos sac bek epadecn 6s dé< Gift—Radium, One Gram of, and Box Pre- sented to Mme. Curie ne al os oe ean a — Filer, Rotary, Operates Automati- ee oie a 6k bb bee Reon eeGt Shes ee NOY TNE, TOP. ccc cccccssesessdeve Glass Cutter, Dull, Turpentine for Glass Cutter Sharpening IE EES PR a RR ea Glass Handles for Frameless Window Panes ee PEI, PUD, «ncn cacccccsvecnccees Glass, Red-Hot, Carried on Canvas Belt Con- Er en Glove with Slit for Wrist Watch........... Glue, Casein, Chemical Reaction Ateotw. Glue Joints, Casein, Machining Glue Molds theme ae Glue Stains, Removing........... ‘ Glues, Testing Liquid ee ee enw eee Goat, Nanny, Mothers Collie Pups COME TD Ts 2's ce cvcdccvdccecisreceses Gocart, Baby Jumper, and High Chair in One = Bronze, Amount of Thinner Required Gold Dredge, Huge....... Gold Mines, Hunting Lost, foruiia, by Prank TE. MOW6..c.cccvccccvscs Gold Mining, Hydraulic, in New Ze aland. Gold Purity, Spectroscopic Test for OIE BOCRSTIES oc cccaceccccesccas 2 Ce a cs th abeae eke end eared Golf Bag and Valise in One.... Gort Ball Drive, Machine R ecords Le ngth of Golf Balls, Re finishing een pee Couren, Ter, Gh BOB. sci s cc ceces wee Golf Handicapping Done by Novel Tests Golf Score News Speeded by Field Telep yhone Goniometric Instrument is Level and In- clinometer Gopher, Tamed, Dn: -«ithkwes baa eee eee aoe CSOPROE TOD Tiere TROCAMIT cvcdccscccccese Gouge, Offset, and Chisel Handle.... Government School, First, in Englan da. . Government Undertakes Big Projects in Pee, 3G ak odewn ac wena oe eae 60nd cae ea Grader, Road, ‘Rotary ek iae tar alis 0 il dew Grafting External Ears on Infant.... Grafting — Young Trees Nourish Ce BEN Svdoscanbedeee vedo veers aen Grain Elevator, Australian, of American De- De ce kwedetbka nh takes Bite aha kes eee Grain Elevator, Chain-Cup, of New De men. Grain Elevator, Simplified Distributor f« Grain in Wrecked Elevator Pneumatic: ntiy DT Gvaerneubucebhi Gi bGocmer wena Shen Grain—Oats, New Species of, Found in Su- ek - eee Ms ek, oa ceded tows eas seas Grain Shocker Model Works Successfully Grain Unloader Pneumatic, Eliminates ee eer See ee - oe ae SR: ee Grandstand, Reinforced Concrete Granite Block, Record Size.............e.s. Granite Quarrying, Compressed Air.. Grape Juice Factory Waste, Utilizing...... Grass Cutter, Bermuda, Renovates Lawn. jrass Lawns Grown in Three Weeks Grass, Swamp, and Silk, Hat Made of travel Screening, Gravity.........seccesses Gravel Substratum Removed without In- ££ RU ae eae eae Graves, U. S. Warriors’, in Europe Marked by RN eas be ih xed0c Grease Bucket and Pump for Priv: ate Gr 1rage Grease Guns, Tool for Filling.............. Greasing Service, Auto, Inclined Runway for Great Pass at Alexandria, Egypt, Proposed Reet Ge eke so dbo ae 648s ooh Greenhouse, Window .......... Grinder, Center, Made from Drill........... Grinder Column, Axle Housing Used as Grinder, Feed, Auto Magnets Protects...... Grinder, Flexible Shaft, Grinds Ship's Pro- i ee te Se Ses Uo kak bee ae Grinder, Portable, as Chamferinge Tool Grinder, Surface, Shaper Used as.. Grinding and Milling Attachment Contained ee Se Gk ba ated sedate. ad wend awe eae Grinding Arbor, Convenient GTINGINE ATDOP, TIMPTOVOE. ..ccccccccccscces Grinding Cylindrical Parts... ...ccccsoseces Grinding Fixture for Small Pins............ Grinding Machine Accurately Grinds Auto a aa dn eb es ese Sis wie aie eek oe Grinding Machine, Face, Attachment Crowns a!) URS rete Grinding Mill for Coal Colloids............. Grinding Mill, Small Motor-Driven......... Grinding, Wet, a Dangerous Occupation.... Grip, Greet, Makes Joints without Glue of Lower Cali- Pioneer ERR Pr a ere Grooving Tool, Adiustable atta ki a tate dives Weide ea Grotesque Cement Heads Ornament Country Dt <ceisatehidwenvketarscs sens 9 obsea's Ground Thawing with Cold Water Guard Cleaner, Sickle Guard for Smokestack Ladders...........+++ Guards, Sheet Steel, for Shoe Soles.......... Guide Posts for Tourists in Redwood Forest 7 Guitar, Metal, for Rough Usage............ Gulliver, Giant Wooden, Attracts Amuse- ment Park Crowds eer e eee eres eeeeeee 406 946

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Gum, Restaurant Tables Supplied with Paper ES Oe Pra ee ss te th ne 17 Gun, Ball-Pitching, Tests Players’ Skill.... 346 Gun, Buckshot, for Cash-Drawer Robbers... 274 Gun Fire “Spotters,” Naval, Trained on Miniature Sea ..... ere re re apa erry 402 Gun for Killing Trees.........ccccesccceee 58 Gun, Hidden, for Bank Tellers............. 688 Gun—Musket, Floor Lamp Made from...... 952 Gun, Naval, World’s LargeSt.........-..++-. 805 CU, PUOMGOE cece wcckccccvvercessseseeess . 305 Gun Range-Finder Sight Used with Both ‘ PG. nc an ste keane tt eh wd sense Ken ce 725 Gun Riveter, Hand........ weceseessecsooess 321 Gun Shell, Marine, Fires without Flash..... 430 Gun Sighting Ability, Testing.............. 623 Gun, Slaughtering, Kills Humanely......... 236 Gun, Triple-Barreled, Shoots Solid Bullet from One Tube...... cc ccccccccccsccccsecs 5 Guns, Big, Along Street Makes Fence...... 84 Guns—Copper Deposit in Cannon Removed WER. BOT cecccsesess ese e cece eccceecees 88 Guns, Grease, Tool for Filling............++. 599 Gunstock, Extensible, Has No Recoil....... 381 Gymnasium and Auditorium Combined in " SCHOO] .... cece reccccccsecsccveresscecs 714 Gymnasium—Apparatus Limbers Stiff Joints 26 Gymnasium Rings, Cheap..........+++++555 157 Gymnasium—Self Resisting Device for Ex- ree errr Tr 169 Gypsum, Structural Uses of........-.+0-0+5 169 Gyroscopes, Giant, Stabilize Ocean Liners, X by George F. Paul.........ccccccccccsece 652 Hacksaw Attachment Lessens Fatigue...... 765 Hacksaw Frame for Shallow Cuts.......... 454 Hacksaw, Radial, Cuts Pieces High in Air.. 430 Hair Clipper Sharpener...... pete estes eeees 797 Haircutting Chair, Children’s, Seat and codec ccc venesccsacesepeses 252 Hall, Emmett Campbell: Highway, Fine, Built for Freight Traffic Only........... 713 Hammer Handle, Notched.........+-++eee0% 35 Hammers, Quality of, by C. A. Briggs...... 282 Hammock Bed Can Be Folded into Size of a PE TE vce cicccnsusns sous Weectesvesens 457 Hammock, Screen, for Babies on Auto Tour 706 Handle for Auto Steering-Wheel..........-. 411 Handle for Offset Gouge and Chisel......... 768 Handle, Hammer, Notched.........-++0-+e08 35 Handle, Milk Bottle.......-ccccccccecceccee 954 Handle, Nonsplitting Chisel............+.+.+- 758 Handles, Detachable, for Barrels........... 946 Handles for Safety Razor Blades..........-. 311 Handles, Glass, for Frameless Window Panes 901 Hangar Door, Bascule-Type Airplane....... 23 Hangar Door Bearings, Immense........... 854 Hangar for “ZR-2,” by Phil. W. Hanna..... 499 Hanger, Coat, Candelabrum Made from..... 946 Hanna, Phil W.: “ZR-2’s” Fatal Flight..... 499 Harbor at Genoa, Italy, to Be Immensely . Extended ........ eee ee eee eee eee e serene 595 Harbor, Marseilles, Size of, to Be Doubled.. 642 Harbors—Enormous Lock at New Orleans, by Robert Morgan.........-sseseeeeeeees a4 Hardening Divider Points and Scribers..... 2! Hardness Testing Tool........-..eeeeeseees 892 Harness Hitch, New, Distributes Load eS PEELE EE ree +4: Harness Repair, Simple............+4+5 neke Harrow, Swivel Runner for.........+-ee5+-5 461 Harvesting—Sling Aids Unloading Hay..... 133 Hasp, Double, for Sliding Doors............ 2. Hasp, Screwless Padlock ........ss+eeeeeees 293 Hat Made of Swamp Grass and Silk........ V1 Hat Stretcher, Making a........ eh see dae me 797 Hat Trim Made of Fish Tails.............. 493 Hatchery Pools, Trout, Small Roofs Protect 808 Hawk and Woodchuck Good Friends........ 921 Hawser Trap Cages Ship Rats............. 323 Hay Mower Distributes Hay in Loft of Barn 864 Hay Unloading, Sling Aids............6+.+4. 133 TRORGOR, TASTE coc ccccccccccccccescccecccss 314 Headlight Lamps, Coal-Mine, are Menace... 227 Headlight Lens Washer, Substitute for..... 791 Headlight Wires, Protecting....... ss a eis dt 951 Headlights, Auto, Antidazzle Device for.... 562 Heads, Grotesque, Ornament Country Estate 550 Headstones, Grave, for U. S. Warriors in Europe ........ re sn rer 198 Health Department Tablet Renders Camp Water Drinkable .........ceeeeceeeeeeees 397 Health Questions Answered by Automatic a er ear ere POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Health — Swimming Exercise for Crippled SD enh k ous Wa tea ke bad > ook bon “Heart of Gold” for Child Feeding Fund.... Heater, Adjustable Electric DEORE, DURIGET occ ceccccasececaeces Heater, Electric, Converted into Gas Heater, Electric, Fits in Bathroom Wall.. Heater, Electric, for Auto Also Heats Cof- Electric, Kitchen eee we wee for Light Melting......... Water Boiler, Also Heats Heater Letters, Oil, Prizes for....._. Heater, Heater, ey Parlor, Resembles Phonograph Small, Made from Flowerpots Heater, Two-Position Electric.............. Heater, Water, Auto-Exhaust, for Tourists. Heating Device, Carburetor, for Autos Heating, Outdoor Water Hedge Made of Plants................ee-0-. Heel Plate for Male or Female Auto Drivers Helicopter and Balloon Combined in Air Crertt, by Wi. FL. But... ...cccccscccase Helicopter Demonstration, Prize for........ Helium Gas, Noninflammable, Airship to Be YN a een Dig kd noes cen eds & occ cs Helmets, Steel Trench, oo eee 151, Hemp Growing for Longer Fiber........... Henbane Grown as Neuralgia Drug Henhouse, Draftless Ventilator for Hens, Laying, Device Spots Heredity Essays, Prizes for Heroes Immortalized TD wiiend orb ncmdbiwaee ese ce Herring Scales, Pearls Made from.......... Hides, Automatic Skinning Device for = Chair, Baby Jumper, eee eee Ce eC eoeeresreeeesece “ and Gocart in Lhe eid ipih anh eh dea nil BG wr Gai ae 6k Gk sw ec High Dive, Boy and Girl.................. Highway Building in Morocco.............. Highway, Fine, Built for Freight Traffic Only, by Emmett Campbell Hall Highway Information Booth............. °°" Highway, Perfect, One Mile of...........0.. Highway Road Laws Forced Upon Eastern Eh ee a Geils atals «aco ais aed whine oo bad Highway Signs, New, Courtesies Fostered by See SOP DORTROORON . 0.45.64 soo cccnsecc ce... Historic Events Immortalized in Sculptured ee age i betes Hitch for Horses Distributes Load Equally. Hitch, Scraper, One-Man................. ee: Hitching Posts for Automobiles er Business Man’s, Elephant. “Statues EE ne Prt ae ES Hog Raising, Mechanical Farm for, by G. H. eee Hog Trough, Sectional, is Easily Cleaned... Hogg, John Edwin: ovie Men, Fighting Pirate, with Mirrors River, Mad, Harnessed in a Reclaimed DME S0WbthHineshdtatcesdheenacdes cee i... Hoeg’s Ear, Silk Purse Made from Hoist, Line Shaft Used as.................. Hoist, Mammoth Mine, Lifts Cages 30 Miles . Sea re ee Holder, Drill, Turret Lathe Holder for Burning Cigars Holder for Flowers see eee eens Holder, Music Score, Turns Leaves Auto- NE EA A cot nin Sala Sv 6 Wich Abas de-aree ne & Holder, Score Card, Clips to Table......... Holder, Screw and Bolt, for Tight Places... Holder, Self-Centering, for Drill and Reamer Holder, Tool, for Short Bits................ Holder, Tool, Three-in-One Hole Burning, Concrete, with Oxyacetylene Torch Cee CSCS eseeeeeeeerseeseereeseseseeeceses Holes, Blind, Transferring.................. Holes, Center, Scraper for Truing........... Holes in Patterns, Making Dowel.......... Holes, Long, Drilled Axially Parallel Holes, Oversize, Reaming Small Holes Protected When Welding Holes, Steel, Made Best with Punch......... Home, Beautiful, without Walls or Doors, by John Anson Ford Home Builders, Plans for eee eee Home Lift, Right Kind, Shawnee, Oklahom Offers Prize for o 73 218 934 220

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ae Oe Cees SS lUlTC ll a> OF CI AOCithy ~~ oO Same 522 27 867 179 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 21 Homesteaders, Auto Caravan, Warmly RE OR BON as shoes ce vevongcevoccsar 893 Homesteaders Go West by Motor Caravan... 671 Hand Substitute, One Handed Card Players Pe Lene S ee ARCA ER SSE RSAS SOE D OO 6.060 4 Honey and Poison Used to Kill Ants......... 46 Hood, Automobile, Asbestos Protects...... 958 Hood, Automobile, Held Open by Spring.... 534 Hood for Oil Stove Directs Heat........... §92 , S, kce dn ether tee ROWS OO Ode 08s 612 Hook for Lifting Window Screens.......... 316 Hook Lock for Logging Cables............. 410 Hooks. Screen-Door, Aid Automobile Ven- Da ah eat Rais ano. a cb eke ab be OH 297 Horn, Bass, Carried on Cart.......scccccese 714 Horn, Homemade Bicycle.................. 304 Horn on One-Stringed Violin............... 266 Horse Clipper, Bicycle Drives.............. 290 Horse Hitch, New, Distributes Load Equally 893 Horse Kiddie Car, Propulsion.............. 856 Horse, Toy, Made of Straw..........css.sees 440 BO Bee TOT BOP ccc ccccccccccvecese 737 Horses, Fire, Honored in Los Angeles...... 895 SE, WEEE, WOOD BP ccc kccicescvassecese 339 Horseshoe Pads Made from Old Tires...... 625 Horseshoe Pitching Tournament Offers TE hide bs ee ew REAR Raa poh soso aaa 479 Hose and Car Coupler, Automatic.......... 815 Hose Connections, Sidewalk, San Diego, Cal- Te ise ccc ce be eecadd cRE RESO 6-0 0 80 588 Hose Cutting, Fitting, and Welding........ 461 EO, Ses DOE occ ckectescuseccncwes 305 Hose, Metallic, Automobile Tubular Radia- Se 6 cea CeGanes es tatadsecee a's 88 Hosiery Sales, Window Display for........ 140 Hot Loop for Plumber's Fire Pot.......... 772 Hotel Bus, Luxury and Comfort Feature... 837 House, Automobile, Has Modern Improve- PE 46 ce kee se eecdra de eens bet ean sabe ues 337 House, Baptist, Moved Thirty Miles by Water ! House, Beautiful, without Walls or Doors, & ee | ARPT ree House, Belgian, Serves as Model for Office.. House Building Record, Texas Bible Class I Ohi diene: deidinids i ad en hae ce wl a ae House, Cave, of Boughs and Thatch House, Community, Erected in Day House Hunting by Airplane............... House Made of Old Street Cars............. House Made of Sea Shells.................. House, Metal, is Fire, Storm, and Rat-Proof 3456 DO ae ee House, Mud, Cement-Coated...... House, “My Old Kentucky Home,” Purchased 5 House of Houseboat Beats Rent Profiteering 582 House Plans, Bureau Furnishes............ 867 House, Portable, for Ice Fishing............ 943 House—Shrine to Buffalo Bill on Lookout Mountain, by E. C. MacMechen........... 325 House, Steep Roof, for Crater Lake Park RS ok DO Cava dw eee aaa hae hed ae 73 House, Summer, of Cape Colony........... 224 House Veranda, Large, Made of Stream Safir ana ls tn. aie 3b aie ask ha te 218 Houseboat House Beats Rent Profiteering.. 582 Houseboat, Unmanned, Steered and Con- CREE AMOOUORTIORIEY oo cn cc cccsescncvesee 844 Household Devices....112, 272, 432, 592, 752, 914 Houses, ~ 9 Shingled, Prizes for Photos and Plans eaatctdia ane dere td eh Aa aa ote 8k km 649 Houses, hird, DD TOO GM. pcsccavcnces 956 Houses, Bird, Mounted on Poplar Trees.... 682 Houses, Boy Scouts Build, without Nails or Dar Se eae ak ae eae aw ke eh ae mee he 600 Houses, Improved Method of Fabricating, oe OS SPP rrr ree 102 Houses Moved from One Town to Another. 6384 Houses, North American, in South America. 414 Houses, Ready-to-Use, Supply Californian’s 0 re eres eres eee 789 Houses, Seven, Grow Where One Stood Be- SE Sabekue ek 604 ac6.08 = tole babance ee dueees 425 Houses, Tent, Have Winter Overcoats...... 886 Houses, Tentlike, Protect Lambs from LE eer terre er re 384 Houses, Fire, for Railroad Labor........... 715 Housing, Axle, Used as Grinder Column.... 291 Housing Problem Solved by Indians Return- _ » & —"“Saerrer 108 Housing Survey by Minneapolis Mail Car- Ee are Seb adbee seatat tant aneaee 650 Howe, Frank B: Baseball Pitching Machine Uses Com- WOU, BRP oc cccseccccsccncsccesses coe FOB Howe, Frank B.: (Continued) Beets, Sugar, Automatic Cleaner and BE GOP wee bivwesecvesisn rer Bullfi, ht, Humane, is Novel Aff: vir. ; 825 Mines, Hunting Lost, of Lower C alifornia 225 Ship, Unusual Honors Accorded.......... 191 Telephone Posts, Fifty, Erected Per Day. 865 Human Body Action, Device for Study of 540 Humidity, Uniform Air, Maintained with eee ee 692 Hunt, Wm. H.: Air Craft ¢ ‘ombines Helic op- ter and Ree aieseapaatna 5 Hunting Boat, Unsinkable.. 7 Huts, Tie, House Railroad Labor.. Wa ‘+ ae Hyacinth, Water, Fought with Steam...... 68 Hydrant, Fire, Force Increasing... wid ae Hydrants, Protected Fire, of Long Beach, NN rer Troe bGaben eens 109 Hydraulic Gold Mining in New Zealand 75 Hydraulic Jump Prevents Food-Water Dam- ie, er Se, Ws, PEs o60c0 ct ietakacewess 709 Hydraulic Pressure for Testing Castings.... 135 Hydro-Airplane Model is Tiny Trinket ~. 204 Hydro-Electric Plant, French, Has secede ‘Water PE: tcicnce aan nekbe se a 68 Hydro-Electric Plant Proposed in South C: ES Ee ee ee reir ‘ 852 Hydro-Electric Project Planned in Formosa by Japanese Government. , Hydro-Glider for Ocean Joy ‘Ride | aoe Pevyarometer Protected ..iccccecccvsascveces 93 Hvydrophobia in Chicago, apeeamaieery Out, by Hebert BH. MOUutOnm....cccesss 9 Hygrostat Maintains Uniform Air ‘Humidity 692 BOG COMORNGE OGG sc cccicscecsvevecesecesece 727 Ice Cream Cake Serves 2,000 Persons.. R83 Ice Cream Delivery Truck, Improved....... 408 Ice Cream Freezer, Instantaneous Action 520 Ice Forms Drydock for Ship.......... . 535 Ice Preserver Prevents Wasteful Me iting . 572 Ice Yachts, Building EOE pic canbesbtans seeds nnn cae . 947 Iceberg Withstands Sun’s Heat for a Year. 11 1 ' An—Part I, Hull con- Icebergs at Sea, Locating, by G. F. Lees.... 4 Iceboat Made from Motorcycle Parts.... 6 Ignition, High Tension, for Old Gas Engine. 76 Ignition Tester, Antishock, for Faulty Spark Tt sc siwhs-s Mae beens ke. ee h en's . 114 Immigrant Babies Begin Life P ropitiously \ ae Impact Machine Tests Rocks.. 557 Incline, Assembly Hall, for Wheel Chair PU 6. ba chbun vant aees scree eenwee Pe 882 Inclinometer, Ganiometric Instrument is... 35 Inclinometer, Twin Dial, of Great Precision 854 Incubator, Baby, Heated by Electricity..... 356 Incubus, The War, by H. H. Windsor...... 348 Index, Telephone, Hinged....... 248 Indian Mortar and Pestile Embedded in Pee See Wess dccscecvecnvans “és Indian, Sioux, Full Citizenship Allowed 102 Indian Village Walpi, Arizona is One of The _ eee 2 Ue. Be skanceecan satée . 888 Indians, Nez Percé, Solve Housing Problem. 108 Indicator, Airplane Wing-Load. Indicator, Boiler Draft, Records "V: ariations. Ro Indicator, Boring Mill............ ' s+ 88 Indicator, Center, for Milling Mac hine... 616 Industrial Efficiency Information, Belgium Seeks Information Booth, Highway, for Tourists... 748 Inking Pad for Rubber St: eee . 383 Inn, Curious, Noted for Chicken’ Dinners... 908 Insect Pests, Airplane Used to Combat...... 520 Insects Appear to Be Chemical Machines, by ie ie SE nawre be CAG 6 eas wie dba belie Bale 442 Insects Display Sense of Property Owner- ee Se es ae bck budemseveevnue 922 Insects, Imported, As a Boon Prove to Be Bane a Se SE a are ree eee ee 572 Insects—Mosquito, Unknown, Causes Trouble i Asem, OF C. A. DPRRGs cc cccccesivasé 442 Insigne Adopted, Submarine................ 899 Inspection, Naval, Via Seaplane............ 31 Institute, Pasteur, War Work of............ 734 Instructor, Cardboard, Teaches Army Sema- Re trae ln Sawa i oa woh oh iim 6 oe he 271 Instrument Makers Wanted by U. S. Civil 7. . RA aera 479 Insulation, Basalt, a New Kind of.......... 62 Insulation Scraper, Efficient...............6. 133 Insulators, Heat, Limestone Wool Made into 7 Insulators, Metallic Magnesium for........ 365 Insurance, Auto Repair, Garage Gives...... 894 Intake Pipe Fitment, Engine, Saves Gas.. 241

Page 22

i i 4 1

22 Invalid Lifting Crane......... “ Invalids, Electric Sedan for...........s00.. Inventors Competitive Exhibition Held in SPO teedbhikecneeae wae eee a akwes Inventors Laboratory, Japanese, to Be Built Farrer iy Tr er erere Iridescence on Surtace of Lens............. Iron Blocks, Cast, for Road Paving....... BPO, CGE, “SOA ck cc se cde Reet dccsreceeser Iron, Electric, as Are Rheostat BOOM, TELOCtTIC, BtAMG TOE oc cc ccccwccccsesesve Iron. Gas, as Tinner’s Furnace Se NCEE io 6 ane tothe awnne oes eens 6406 Iron, Structure of Steel Compared with.... Ironing Board, Flatiron Stand Fits in End es ee of Ironing Board, Im-a-DOO?r. ....scccccccccess Ironing Board, Ladder, and Table in One.... Irrigation Dam Gate Made of Wood........ Irrigation Ditches Cause Stupendous Loss, by Lawrence W. PedroSe...........+-se0% Irrigation Reservoirs, Largest, SEE ccc chee ec ceases saceseasnerserss Irrigation System, Concrete, by A. J. R. Sree ee rrr rr rrr Teor re Trrigation Water from Mountain Snow Islands, New, United States re Jack, Emergency Auto...... os Jack, IMprovised ......cee eee e cece eeeeeeees Jack, Tire, is One Piece Casting Japanese Makes Wonderful Badurance Sledge oo es rrr rer rr rr errr rT Teer 70m, Attachment, Parallel, for Woodworker's RS Ri ae re BES eee ee “Jazz Boat” is Merry-Go-Round on Water.. Jellyfish Filmed to Show Muscular Reaction Jenkins, B. J.: Firemen Found and Main- St EN OE, ci weaned Reece en hens oom Jewelry—Cameos Formed by Minerals Drip- Set SPOR COPOPR: THOU. cna cvscdwscoccccnes Jib Crane, Contractor's, How to Make Jigsaw from Old Sewing Machine Jitney Busses for Kansas City.........cceee Joint Device. Lock, for Drilling... Joint, Flexible, fof Angle Flow CBR Se eee eer rr rece Joints. Casein-Glue, Machining............. — Electrically Welded, Tensile Strength re eee eee ee eee ee Joints, Stiff, Gymnastic Apparatus for Lim- Onis cae nk Caw ba ee lek a ee aS Oo Joints, Wooden, Steel Grip Fastens........ — Bearings, Improved, for Railroad SE Oe wine & ieee a eas dS Meena Jump, Hydraulic, Prevents Flood-Water Damage, by Geo. F. Paul Jumping Automobile Jury Room, Convertible Bed for........... Jury Women, Courthouse Rooms for “Kapok” Fiber Made into Fabric.......... Kean, John W.: New Lighthouse Devices BREOMCATE MEATITNOTS 2c ccccccecsssscccers Kerosene Cleaner for Use with Hydrant... Kettle Holder for Camp Use Deeenem, “Some, TEAMING: «00s a ccccccccctcse Kettles, Galvanizing, Exhausting Fumes from Key Ring Auto Tool..... . me Meee COMMER, THIMGEIG. 0 5c cc asccccccsecee Key Ring Tag, Identification.............. Keyboard, Standard, for Portable Type- writer Keyway Brooch, Adjustable....... Kiln Dried Lumber, Testing................ — _— Type Cement, with “Automatic Rs Cie iad haben es VARA OEE bo ORES Kindling Wood, Unloading................. Kinney, Frederic: Road, Scenic Mountain, OO EE. Sr er eee Kitchen Breakfast Nook, Easily Made... Kitchen Utensils: Basket Cart for Carrying Provisions... Broiler, Meat, for Open Burner Brush, Floor. Spring Handle... Chair Has Manifold Uses.............. iets Churn, Quick Buttermaking.............. Drainer, Dish, and Cooling Tray in One. Dust Pan that Holds The Dirt............ Eee Beater, Electric, with Detachable PPR a err err re Freezer, Ice Cream, Instantaneous Action Ironing Board, Table, and Ladder in One 700 421 Ladder Set Make Neat Scaffolding

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Kitchen Utensils: (Continued) Knife, Bread, Serrated Edge Milk Bottle Stopper Remover Pail and Strainer for Refuse........... Pan, Aluminum Cooky, Fits Any Oven. Pan Lifter for Pressure Cooker Peeler, Orange, Improved.............ee. Peeler, Potato, that Scrubs The Skin..... Potato Curls, Twisting Screw for Making Rack, Dishpan, that Fits The Sink....... ee LECT OT TRUCE CCTTTE Ria wi Rinser, Bottle, Fits on Faucet PURGE, DOCGRMIEE. 0 odors cae ceesapzrcnesec Scraper, Pan, Nickel Plated............. Shakers, Salt and Pepper, that Excludes SO SPRDOED acca cassie sce vrseciavessve Sharpening Machine for Household Cut- TT MEPS CCT CC ors Coe CO OLE LAC ELL Spoon, Non-Sliding Cooking.............. Sugar Holder, Sanitary, for Cube Sugar.. Table, Extension, for The Kitchen Tea Container for Tea Pot Wee FOO MOOtNS ng cc i cceccaccsececese Warming Plate, Electric .........--..0.6 Washer, Tiny Towel, for Kitchen Sink.. Kitten Taught to Strike Typewriter Keys.. Knife and Saw Combined... ..cceccccccsces Knife, Automatic Skinning, for Hides...... Knife, Bread, Serrated Edge Bmife, Cocoanut Seraper...c.ccccccccesecse Knife, Fork, and Spoon Combination Knife Sanitary Surgeons’......... Knife Sharpener Works Rapidly by Hand. Knife Switches, Operating ..........cccceee Knife, Tobacco, Clips Off Chew............ Krupp Works, Essen, Germany, Daily Out- put of ee

Beer. One. The Bates TOS << coccccccevs vases Laboratory, Forest Product, for Australia. Laboratory, Japanese Inventors, to Be Built OP SN A tecceecGieen dade ee Cbs acu apee ese Laboratory Woodwork, Waterproofing..... a New Brass Made Tarnish-Free ee ee ee ree re eee L@eguer Bap Crom Trees. ic ciccicccscscscces Ladder Safety Attachment Ladder, Table, and Ironing Board in One.. Ladder Workers, Steel Shoe Supports Add NE i eS Bek ee ne eee ae one Ladders, Smokestack, Guard for Lag Screws for Concrete Floor............ Lambs Protected from Weather by Tent- like Shelters Lamp, Are, Low-Voltage 2 Pe: co wre ke Re keno hh emnne Lamp, Bicycle, Small Dynamo is Power for Lamp, Bottle Camp Lamp Bracket, Adjustable Compact........ Lamp, Burned-Out, as Spark Plug Tester... Lamp, Detachable Electric ...........ee00. Lamp, Electric, and Fan Combined Lamp, Electric, “Baby Vamp”........eseces Lamp, Electric, with Cable Reel for Gar- ee ee Lamp Filaments, Electric, Machine Winds. Lamp, Flash, Photographer's Portable Fold- ing, Controls Angle of Light Lamp, Floor, Made from Musket.......... Lamp Post in Harmony with Spanish Mission Lamp, Reading, is Lighthouse Model. Lamp, Sewer Inspection ........cecceceses Lamp Shade Bag Protects Lamps While | RRR RSE ae ere an came Shades Made from Steel Trench Hel- ets Lamp Shield, Portable, Made of Aluminum OF awa ean cde eeevactsiseocerereveccrseges Lamp, Trouble, Holder for.........--.ceee. Lamps, Coal-Mine Headlight, are Menace.. Lamps, High Intensity, for Motion Picture PRE Détethikuad debs) ee deat 6 caneas Lamps, Miniature Tipless, Sealed by New DE, einen Hoh OA baw AAO ee eee Land and Money oe Alla District of oe Re A ae Language, Chinese, Mastered with Linotype PE “iteh beh akGhS vee ok CRRdm keds tkah ee Language, Photograph, in Correspondence ID cen Skid oe dia a Ae i ne ale a oakland 208 Lantern, Electric, Shows Red and White BES concn necenes

ee

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WCTONTNAR S BNWOILO ON WUTWh boty

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Lantern, Projection, Uses No Slides....... Lapping in The Milling Machine........... Lapping, Plate GlasS......ccccscccsevcceecs Latch, Sag Proof Gate......cccccccccsceces Latch, Scr@enm DOOP ..cccccccccsccccciovcses Latch, Simple Window ........ccccccsccess Lath, Expanded Wooden, is Competitor of Pn Me. vcceGeGaeseksbarebheheoeacvenedss Lathe as Clamp, Using............ Lathe Carriage Safety Signal ............ EMte CeemtOr GBRMO occ cccsescecosesscvesss Lathe Centers, Instrument Tests........... Lathe Centers, Stationary, Finishing Work casi ci bie aeoeneeac de 560600006500 Lathe Chuck, Universal, Truing a Lathe Chucks, Bench Stand for............ Lathe, Commutator Slotting in The......... Lathe Counterboring Device, Useful Lathe Cutters, Wedge Principle for........ Lathe Drill arid Reamer Holder, Self-Cen- SOE SKK NK dDSS ROK OERARO DOD DEDE ROO REO 84S Lathe Driil- Beene, TUSPOE: x .censscecoces ss Lathe—Emery Sparks and Dust, Catching. Lathe, Enormous Wood, for U. 8S. Govern- DE RSS tw dw ne ds 600 an deeded pwusee eens Se Lathe Fixture, Vise as, for Milling and Drilling Lathe Hole Drilling without a Drill Chuck Lathe—Holes, Long, Drilled Axially Parallel —_—_, Irregular Wood Forms Duplicated EE tb ence kik) <es GAR CEERE OST RRS ashe ee Lathe, Milling and Grinding Attachment CO OM bso dma esdisedes 44s en eueneee se Lathe, Portable Round Bed, Capacity se all re a i ih ob Soa la chien aN WA Seca the i Lathe Rule Solves Many Problems Lathe—Segmental Plates, Turning Lathe, Six Inch Bench, Making a Lathe Tallstock Die Holder.....<cscscccccecs Lathe Thread Cutter Uses Carbon-Steel Tool Lathe Tool Cuts Radii Accurately.......... Lathe Tool Saves Changing.........cccccees Lathe Toolholder, Three-in-One ........... Lathe, Universal Thread Milling Attach- PE CY ost ecb bie Es end Bewes ee eeeed Lathe Used to Cut Rack Teeth............ Lathes, Self-Centering, Steady Rest for.... — Bilge Pump for, Electrically Oper- GE. Lede nck aks cab eeadkdaw eer CRM heeteae ee cin Launch, Camp, Convertible into Auto Top.. DEE, Oe, BORO a oc 5.0 6 ons Kedunsch Launching Scout Cruiser “Milwaukee” Bow DE Pubcon 1 Dae ta SS KES EKO Sw HOO Se Oe ee Laundry Appliances: Drain topper, Overflow... .ccccscsecccecse Ironing Board Fits in Wall Door........ “as Board, Table, and Step Ladder in Dt Siiiaksnbe tthe inean eases e cee weenie Mangle for Ironing Ruffles and Garment Fullness eee eeeee eee eee ewes eee eee eee Tones for Handling Hot Clothes in Boiler Washboard Has Removable Rubbing I ibe ak Lalas Rr Glnis wees Oba eee Washer, Tiny Sink, for Towels........... Washing Machine, Aluminum............ Washing Machine, Small...............0. Wringer, Electric Centrifugal............ Laney, Automobile, Washes and Polishes I iia Abate a eiate i kits ie de dah Ria ete ke ee i Laundry Boxes Move in Endless Train.. Lawn, Bermuda Grass Cutter Renovates... Lawn Dice, Large Wooden ......... -ceenen Lawn Grown in Three Weeks Lawn Mower as Baggage Truck Lawn Mower, Safety Device for........... — Mowers, Self-Sharpening Attachment _ RS SSR ar Aree Lawn Pattern Marker, Compasslike. Lawn Sprinkler, Whirling-Head, Propelling idl wn Sweeping with Water............e00. Lawn Transformed into Theatre by Pneu- matic Roof. by Henry S. rare Laws, Road, Forced upon Eastern States. Lead Alloy Sheath for Water-Tight Wiring Lead Calking Salvaged from Old Water- ED 26 ata aed dene 0% Lead Gaskets, Making .........ceecccecees Lead Joining to Wreaehs Tron Pipe.. Lead Lined Tank for Sulphuric-Acid....... Lead Pipe, Preventing Water Action on. Leaf Mulch for Trees...........-cceeeecees Leather Brogue, Imitation............- waee is _— “16 @BeI-1O ion Oe to +) +3109 Lees, G. F.: Icebergs at Sea, Locating. Left’ and Right Handedness, Curious Facts Pe” bS:n ons hs ee eke eb Obs as 6d 00% eae Leggings, Hip-Length PEE on Gece hed ducecnestovesnceese Lemonon, E. H.: Air Currents, Effects of, Tested with Air- PE ceebwenatsa abo ee bh 60 +6 bac keene Crossing The Sahara by Motor Lorries... De PE ac tvcdeaveeenasawe ce Lens, Iridescence on Surface of.. Lens Washer, Substitute for........... -e Letter Envelope Has Perforated Sate ty Flap Letter Machine Inserts Two Inclosures for re ke an wesw eee We ee a's Letter Scale is Springless and ‘Acc urate.... Lettering Gauge, Draftsmens Lettering with Two Triangles.. anes Letters Chiseled from Rock by Water...... Letters Circle Globe in Time-Travel Test.. Letters, Display Frame for...... Letters, Metal, for Wire Screens.. Letters, Oil Heater, Prizes for Levee Controls Colorado River............ Level, Goniometric Instrument is ini dit Lever Arrangement on Truck Dumps Road eS errr er ree Lever System Lifts Dump Wagon ‘Sidebo: ards Liars Detected by Machine............ Library Census Shows Need of Exte nded rr errr Te Tere Library, Library Table, Writing Desk, and Dressing Table in One rary Life Preserver, Line Carrying Buoy Serves Life Preserver, New, Makes Sinking Impos- sible 5 ech ie ea ‘ Reet Dee DOP POP OOOR ss vescaccescecccenese Life Rafts for California Docks. on Lifeboat, Double Deck, Carries Seve onty. awe Lifter, Pan, for Pressure Cooker : Lifting Crane for Helpless Invalids........ Light and Heat Experiment Set, Toy Light, Drop, Telescoping ......... Light, Electric, and Power for Philippine Pe Sun cenacenes ss Light, Emergency, Ignites When Others Fail Light Generating Plant, Transportable. Light Post Street Signs for Chinatown, San PRE. doeccwacdauetdx'a's Set ae chew Light, Revolving, for Park. Light, Semi-Indirect E lectric, Pt vcdtng deine wknd a eas can) 660 6 6 AN eee S Light Sets, Christmas- Tree, Now Obtainable BS Ear pen a Light Signals, Secret, of Germans, by C. A. PE cv eneiadagees eae Ria ok irl ere Light, Studio, Bequinted by Triple Current COS. oazaes — ; er Lighthouse Devices. New. Safeguards Mar- iners, by John W. Kean.... Lighthouse Model for Reading Lamp Lighthouse, Snow, Building a. ‘ , én Lighthouses, Untended, Have Curious Mis- DS vchedents kp eeshes 64-0 Lighting Fixture, Largest Indirect Lighting Fixture, Trench Helmet Lighting Plant, Electric, for Sled.......... Lighting Power from Surplus Water-Supply Lighting Switch, Automatic, Turns Lights 2 £ 3) sere : Lighting System for Garage W ash Rack.. Lightning Destroys Gasoline Tanks with- out Striking Them.......... ‘ Lights, Colored, Stage Scenes Changed by. Lignite Utilized as Fuel by Gasification ee are Lime Bags Made of Special Paper Lamericn Praee, Pifth Lane... .....sccccccs Limestone Wool, Heat Insulators Made from i er RS nc vais s sabe 6 kb eee ees one Limousine Built on Truck Chassis.......... Ree, CO, POE GB veces ccicvonencoes “Totally En- FO ee eee eee Lining Cutter, Brake, Has Transverse ER na wawnhss640cewese Linoleum Dry-Rot, Preventing.. Linotype Machine, Chinese Language Mas- SO OUD caencscusceewscs naam F - esepesen Killed Near Montrose, Col- EEE rrr rrr Liew's Skull, Bone Structure of, ‘by Cc. A. RR eee reer Pre tee Liquid Measuring in a Barrel..........+.6+- Public, Great Chicago Fire Starts 83 wiots 105 896 654 906 538 602

Page 24

24 Liquids, Drawing Viscous, in Coid Weather Liquor Still, wee Concealed, Fails to Fool U. s. BO ER PS rere Load Distributed Equally by — Horse EES ry ere rere eee en ee Loader, Automatic, and Cleaner “for: Sugar Beets, by Frank B. Loading Device Doubles Value of Trucks... Lock, Auxiliary, for Safe. ° Lock, Door, Made More Secure. Lock Fitting Chisel Dee, DO SARE BMGs ce ccezeraccecuccsevese Lock, Hook, for Logging Cables.... Lock Joint Device for Drilling ck, Semaphore, for Locker-Doors BOGE, DERDIS WiRGOW scccccccsccccercvrecse Lock, Tire, Incloses Rim Stud Lock, Window Sash, for Doors............. Locks, Burglar-Proof, by Simple Device.. LOCKS, Cylinder, Opemin® ..cccccccccsccsecs Locks, Door, Timing Combination.......... Locks, Enormous, Link Lake and River at New Orleans, by Robert Morgan......... Locks Used by Two or More Persons....... Locomotive Automobile, Cross Country..... Locomotive Dragged from Mud Grave by eR rrr ere a rare Locomotive Headlights, Coal-Mine, are Men- ie dana t,o aa ae a aie yA ae Dh i al ea a a Locomotive Run by Superheated Steam.... Locomotive Slide Valve Changed to Piston DE Kttccdadeveie kMaseineuns webb eisee ae ae Locomotive Swing for Children............. Locomotive Throws Cow Against Switch and rarer aera Locomotive Tipped Over on Side of Levee. Locomotives, Earliest and Latest, as They i CE céoben sans sede een eewae woes Oa Locomotives for Chinese Government...... ar meres Mine, Storage Batteries Tested Ler Cabins, Steep Roof, Park Officials a et er inne Log Carriage Ways, Cleaning Log Flume Built Along eee ee eee re Columbia River te céw ethene eeee had nue sa et eee abe ee DO ee Be ee ee Log Snagging in a Lake, by A. B. Elliott. Log, Spruce, Table Made from............. Log Train Snubber, Efficient Feature of, by Lawrence William Pedrose.............. Logging Cables, Hook Lock for pa | ere Logging, Hand Band-Saw for.............. Logging—tTree, Giant Redwood, Moved in Upright Position, by Oscar C. Davis.... Logs Break Stoppage Boom............... —_ Skidded to Mill without Flumes or _ ERE Serre rr rney ar Logs Stored in Small Pond by New System Lord’s Prayer on Tiny Printing Slug Lubricating Oil, New Instrument Tests Vis- ET WE ae bine wk a ee Oe ae Oe ae Lug, Connecting, for Auto Batteries....... Lug, Rim, Improved Automobile........... Lumber as a Crop, by H. H. Windsor Lumber Industry, Saw Guide Aids Lumber, Kiln-Dried, Testing .............. Lumber, Large, Tested by Huge Machine.. eee eee ae errr rer ee Lumber, Northwest, Reaches Enormous PD: scabken cues edad baad ene’ aad ewe eS Lumber Waste Utilization Promoted by Forest-Service Exchange .........ccceee. Lumbering, Tractor Locomotive Used for.. Lumbermen Carried to Camps by Tractor. a pap Stoppage, Instrument for Record- Machine Stoppages Recorded Automatically Machine-Tool Chuck, Patent = pee Cutting, vied kee RNs ed Cheha ee ae ane oe See Machine-Tool Slides for Home Shop.. Machining Casein-Glue Joints.............. MacMechen, E. : Shrine to Buffalo Bill on Lookout Mountain...........cceeeeees Magazine Contributions, Prizes ere Magnesia Deposit Clogs Water Pipe....... Magnet Holds Screws and Cotters......... Magnet, Point-Contact, Picks Up Phono- SD ios Kec as ssn eanende tena cous Magnet, Submarine Seawee. Recovers Ship’s PD cco rt achaketas teir kets e pak eees ° Magnets, Auto, Protects” Feed Grinder..... ee Speed 937 88

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Magnifying Glass, Leather Mounted.. Mail, Air, by H. H. ers awe Mail Box, Concrete Rural.. Mail Carriers, Minneapolis, — Raa ar errr Mail—Envelope Has Perforated Safety Flap rae ie Sea ae

’ 4 7 4

Page 25

AShitilhabinieds: jl ilaie cntnat: uaianiod.

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 25 Metal—Steel, Stainless, Using.............. 604 ee Structure of, Compared with Iro Metal String Instruments for Rough Usage 482 es Alloying, New Discovery on Action Sh ie Linea ehh ee KO Ra eRe Ge AE Ab oe Wee 234 Metals, Electric Torch for Melting.......... 228 Metals, Heated, Temperature Measuring In- Ce tke eh eee ee ee 6 Oke we Oe es oe on 873 Metals, Smoke Shortens Life of............. 889 Meter Pump, Concrete Mixer, Regulates Wa- PEE 6 wes eee neaseedesccsenuseseenes 85 Meter Tests Batteries Three Ways......... 382 Meters, Water, Testing Inaccurate.......... 294 Methanometer for Detecting Fire Damp.... 745 Metric System Compulsory in Japan........ 260 Micrometer, Internal Thread............... 598 Micrometer Replaces Plug Gauge........... 399 Military Training Essays, Prizes for....... 319 Milk Bottle as Collection Box.............. 794 ee ee BIN soc bree beessccaeniccceecs 954 Milk Bottle Stopper, Tool for Removing..... 752 Milk Cans Made to Look Old............... 285 Milk Distribution Popular Among Plant Pe ccinen hehe i aeda eked ced ewes 918 Milking Machine, Milk-Can Lid Holds...... 573 Milkweed Silk for Stuffing Pillows.......... 951 Millinery—Hat Trim Made of Fish Tails.... 493 Milling and Grinding Attachment Contained NL ai alain x areal Slack seal he Gwin aie wacKGhee m 37 Milling Machine Attachment, Universal DR ok no ck e cece eseseneeend 439 Milling Machine Drilling................... 611 Milling Machine Indicator.................. 616 Milling Machine, Lapping in The........... 776 Milling Machine, Roller Steady Rest for.... 604 Milling Machine, Ship’s Portable............ 376 Milling Machine Vise, Center Finding of .. . - _ 2S are ere 459 se Machines, High Speed Attachment P De CARR OHE Se TOREAREHESDEENO HOSS ECO RESO OOS 8 ee eee 457 Mind, Radioscopic Examination of The..... 165 Mine Car Tipple, Automatic................ 729 Mine Cutter, Coal, Cuts Any Direction...... 338 Mine Depth Limited to Earth Pressure, by oe Ser rae 922 Mine Fire Damp Detecting Instrument..... 745 Mine Fire Fighting with Emergency Fan. 687 — Fires, Chemical Extinguishers Uns: afe en kD S i Oh hee oa Oe ois ce OS es Ob 0069 WRC SS 7 Mine Props, Steel Channel.................. 705 Mine Rescue Work Done te, ae 740 Mine, “Silver Islet,” to be Reopened....... 539 Mineral Deposit Used for a need BORD. occ 585 Mineral Detector, How to Make............ 145 Mineral Oils Best for Wool dE ede 732 Mineral—Radium Found in The Congo..... 586 Mineral—Radium in Box is Gift to Mme. ST eRe GMs Gide falar jm wesw ee deies biases alle Alara Ne ea 371 Mineral— Radium Supply World's not NS alas lia Airc ws dag kw sg Wo 0 Ses oh 37 Mines, Hunting Lost, of Lower California,

Es io crea Sib dais ew eke a 225 Mines, South African Diamond, Air Line for. 241 Mining—Copper Lode Discovered in Island eo kenge Diets ¢ an aiaie See hie algae t 358 Mining, Hydraulic Gold, in New Zealand.... 75 Mirror, Grated, is Danger Freer 268 Mirrow, Rear View, Graduated to Tell Rear ee Sr errr eee 291 Mirrors, Fighting Pirate Motion Picture Men with, by John Edwin Hogg.......... 161 Miter Box for Workbench............cseee0. 796 Miter Box from Nails and Square........... 781 Miter Clamp Holds Pieces for Joining....... 277 Mixer, Concrete, Blows Cement Over Wet EE na din a ae hae ees Keke ke eae de 410 Mixer Pumps, Concrete, Regulates Water ik asta ae ee ewe een ne wee $5 Model, Clay, Fitted with Concrete Equip- a bk na 06 6 ae ee oe ee ORO We Oe ks ck 747 Model, Full Rigged Ship, Weighs Half DE ab6 aT eRe dEdE Se REE SS Cobo DEO SA eeSs 905 Model of Vehicular Tunnel................-. 42 Model Shows Sheep-Dipping Process........ 640 Modeling Clay, Making.............0eeeeee08 793 Models, Statuary, Destroyed by Fire........ 27 Moistener for Gummed Surfaces.. 2 Moistener, Tape, Has Primary Wet Roll.... 195 Moisture Content of Wood, Determining.... 289 De De. DOP esi eastebadpawen en ees eee ot 857 Molds for Concrete Made of Mud ee .. 647 Molds for Ship Propellers........ ixie-cearaee cae Ph, Se accnkeasad ay eveesces oe .. 309 Dees, Tambor, TAM. cc cccccceccvcerese 610 Molds, Plaster, How to Make............... 147 Mole, Tube, and Bridge Combined Planned to Cross San Francisco Bay, by Harry H. at cuti aw ascent a AS CA Dik dei Ge, Rae 521 Money and Land Given Alla District, of Col- i Se, BO cswebesdéereevinsecueed 109 Money Awards from Franklin Institute..... 319 Money Carrying Case Has Alarm Lid....... 704 Money—Coin Counting and Wrapping Ma- Ss ns 6 486.564 dows orci oene 336 mene y—Nickel, Canadian, Proposed Coinage Path ete a aka wh ebee kebeea <<an 482 Senne -Pennies Used to Elev: ate Motion Pic ture Geeta aig aa ONC add de ele.» each ewe 362 Money—-Penny, Simplicity Tax, for Sales BE awuidt nes CAEN KER SOS ba Cees be oleh 23 Money Printing, Private, Proves a Swindle. 251 Money, Stamp Case Used as..... 556 Monkey, Automobile, on Saucer-Shaped Serr ere rrr tT ee 441 Monoplane, Giant Passenger, French Firm SR ee ee eee 550 Mono-Seaplane Makes Fast Trip with Pas- PEE. Seven na swaeSdasensicedeodenanesons 854 Mounment, Dead Police Heroes............. 909 Monument In Honor of Japanese Soldiers... 220 Monument Marks Spot of Marshall's Dis- og) Be ee eee ere 221 Monument, Montevideo, U. S. Se ulptors Com- en ee -cakcaee banh ed Kab 640 6% seavee Boe Monument to Commemorate American In- Or eenees. CU EO SPER ss ose i cccarcsiseveses 483 Monument to Georges Clemenceau... - 841 Monuments of Historic Events and Heroes. 229 Mooring Masts for Giant Dirigibles........ Mop Wringer Cleans and Drys Without DI ctctverdinwas se ohbaanae ewan ee aie: Se Morgan, Robert: Enormous Locks Link Lake and River at New Orleans. 170 Mortar, Old Indian, and Pestle EF mbe dde a in Pe. CEE shad ale kw ae een he ceed se ohn 588 Mosquito, Unknown, Causes T rouble in Bae, BFC. By TEE: vac cccsvecvisen . 442 Motion Changes Size of Things, by C. A. Ow ie eee so WS ee bee Ais oO cee ee Motion Picture Camera, Airplane Dives eee Se” DI Bb bess cccesdccccnes son 729 Motion Picture Camera, Auto Platform for.. 711 Motion Picture Camera, High Speed, for RS ai an a a naka eee ee 6 oe Rs.s 334 Motion Picture Camera, Muscular Reactions OE SORE TOMO WEiccccccccoccscscevese 67 Motion Picture Camera Operated by Electric Py acest e va weads dee cel cei 363 Motion Picture Camera Records Surgical SD dick A. Gis Wie Wik ae Od ne 0s 018 6 : 820 Motion Picture Camera, Twin-Film..... 328 Motion Picture Dummy Protects Jackie Coo- ye Ep | SST eT eee Tre Tere Tre 825 Motion Picture Eve Strain, Cause of. 595 Motion Picture Film Device Eliminates Re- re re rere 732 Motion Picture Film to Explain E instein I flail GE A oie i wee deed MB 9 a Rae ye 901 Motion Picture Men, Pirate, Fighting, with Mirrors, by John Edwin Hogeg............ 161 Motion Picture Photographers Transform DE Siete iseenss sagas bbdee cb deande anes 397 Motion Picture Projecting with ‘High- In- COREE BOE. ca ciciacre 246 Motion Picture Seats Elevated with Pen- bad bee 156 4k Ode en eee decd ae eee 362 Motion Picture Star Has Motorcye le Limou- GE bkcbe x bee dh 644d CRS 00 Kd HK See ORS 920 Motion Picture Thriller, Automobile Jump is 176 Motion Pictures, Actinic-Ray Searchlights DI (es cie eet bee ne atecat ine ene as 200 Motion Pictures, Auto Teaching Simplified PA ccvaseeadketian race tenes esd ecaceee haps 7 Motion Pictures of Plumbing Installation... 229 Motion Pictures Projected without Flicker. 366 Motion Pictures, Talking. Made Possible.... 835 Motor Attaching, Electric, to Sewing Ma- SN Ai ecd he Rin dr es 5.500 0ke 00a wen sess 318 Motor Bus, Detroit, Design Innovations Mark 415 Motor Bus, 14 Seated, Made from Low- A PR GED Ldcrseceae ee vnenseceveceeneee 367

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26 Motor Busses Have Ten Year Monopoly in OS eer . OS SR Ry Motor, Electric Phonograph, Noiseless...... Motor, Electric, Speed Indicator for........ Motor, Electric, Used to Operate Movie Cam- ME sa costa Cake aaa ah aaah es aan aoe as Motor, French Bicycle, is Smallest Made.... Motor Lorries, Crossing The Sahara with, by i, iy EC ccc even ears eweneedee ee be Motor, Single Phase, Starting a............ Motor Truck Dumper Runs on Rails........ Motor Truck Fleet, Photograph of.......... Motor Vehicles, Army, Housed in Museum.. Motorboat Illumination .....ccccccccccscccs Motorboat “Miss America II” is Fastest DY CEE tea sedcewan ean a eal Heres 0.8 on ws Motorboat, Paddle Wheel, Built by French NN CEEOL TOT TT CTT eee Motorboat Shaft Log, Reducing Noise and EE EEC ET reer re See ee Motorboat, Speedy, Defeats Train in 1,200 Mile Run Motorboats, Duralumin, Motorcycle Engine aa a kn nal sia h NG aaa alee aac a a NOn a ound Motorcycle Equipped for Selling Hot Waffles Motorcycle, Ice-Racing, Has Ski Stabilizers. Motorcycle Limousine, Movie Star Has..... Motorcycle Parts, Iceboat Made of......... Motorcycle, Racing, Started by Towing..... Motorcycle Runabout, Londoner Has........ Motorcycle Sidecar Automobile............. Motorcycle Sidecar Race..........ceccceeee we Sidecar, Specially Built Valise Germans Make..... Makes Portable Power fo Statoutpaies, First Aid, for Injured Automo- SG Sic ela tg rie <tie wy de ese IG ig a ae Moulton, Robert H.: Hydrophobia in Chi- Shem, BERMpine Out... cv cccsvesevccsecsces Mount, Harry A.: Marine Warfare, Realistic, on The Stage.. Toys “Made in America” Teach and Train — Crossbreeding, to Strengthen Spe- BE Gh cau ceeeaemipsedes anh eacckenew ae Mount McKinley, Marking...............0. Mountain, Alpine, Elevator Planned for..... Mountain— Mont Blanc, Airplane Trip to rarer rr ert re Mountain—Mount McKinley, Marking...... Mountain Road, Scenic, Blasted from Cliffs, ee ee DN vcs casccdiadearices® Mountain Snow Used for Irrigation Mountains in California Mounting, Emery Cloth............ ° Mounting Photos on Canvas Mounting, Planitary-Gear EOETED, TOGt TRGERL. cc cccssctnscovecsess Mower Distributes Hay in Loft of Barn.. Mower, Lawn, Safety Device for........... Mower, Tractor Propelled, Has Front Gang ee Rr rer oe Mowing Machine Sickle Guard Cleaner re ee Mowing Machine Sickle Sections, Removing ‘ Mud House, Cement-Coated Mud Molds for Concrete... .cscevccscscevscs Mud Shield and Apron for Auto............. Mudguard Dents, Tool for Removing....... ee, men. COR OOO adsc ciciei cca tvedssaes Mulch, Stone, for Fruit Trees.............. Mules Travel to Hawaii in eoermapeenenehate EF ear ‘ Mural Design, Tribune Offers Prize for... Muscular Reactions of Jellyfish Filmed Museum Houses Army Motor Vehicles...... Music. Distant, Phonographic Suitcase Re- NS re er eee se a Music, Light Playing Machine Accompanies. Music, New Sheet, Relieves Eye Strain. Music—Orchestral Composition Contest Open to American Composers .........e2+-e00. Music Printing Plates, Engraving Machine a er ere re ae re ee Score Holder Turns Leaves Automati- IS en ipncdulet accion in de Miata Se el As Wen. ecko edhe Musical Instrument Device for econ heeennarin Musicians Musical Usage Musical Instruments: Drum, Bass, Carries Snare Drum and a Ere ape Drum Snares and Cymbals, Pedal Operates Horn, Bass, Carried on Two-Wheeled Cart Violin, One-Stringed, with Horn eeeeee POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Musical Instruments: ce enenen) Violin String Adjuster......... Whistle that is Easy to Play Musket, Floor Lamp Made from............ Mystery Prize Offered by Cosmopolitan Nail, Double-Headed ............. no Peeen PUNO, VERE POCO ccs nc cwaccicccncscee National Budget, The, by H. H. Windsor.... Naval Adventure Stories, Prizes for........ Naval Base Appropriation, by H. H. Windsor Naval Honors for “ZR-2” Airship Victims... Naval Inspection, Seaplane Aids............ Navy —Gun-Fire “Spotters” Trained on ere aa err Navy Blomanm Makes Good. ...cccccccccccces Navy, U. S., Adopts New Flagship Policy.... Necklace, Bead, Hospital Babies Identified eee ee eee y Needle, Bagging, Made from Can Opener Needle, Phonograph, Plays Many Records. . Needle. Tubular Phonograph............... TEOOGIOR BEBGS IMbO TPES... cciccccccisscess Needles, Phonograph, Point-Contact Mag- _ f. 2 a eer errr ere Negative Scratches, Removing.............. Negatives, Old, Stripping Film from........ Negatives, Paper, Displace Glass........... Negatives, Wet, Bnlarging......ccccccccces Newspaper Files, New Way of Preserving.. Newspaper Offers Novel Prize oo a Re ee reer ere Newsprint Made from Chicago’s Waste Paper News-Times Offers Novel Prize............. Nickel, Canadian, Proposed Coinage of Nitrate, Burning, and Coal Destroy Ship e. ... Bo eee sera ee PO See MEN ic cakseresda dr cn eedawe North Pole, Wandering of, by C. A. Briggs. Novels, Canadian, Prizes for..........ee.e. Nursing Bottle, Sanitary Rubber Nut, Emergency, Left-Hand................ Nut Setter, Flexible Shaft for Nuts, Poilshing ee ee ee ee a | ee a eee er eee ree Oak Floor Finishing og ee ere eee —_ og New Species Found in Sumas Prarie, Observation Car, Railroad Observatory, Se Rei cvs wee pede dis bee ba eee whereas uconye a Ocean Currents, Peculiar Relation Between, and Wind Direction, by C. A. Briggs..... Octopus Left on Beach by Ebbing Sea Tide. Office Appliances: Desk, Folding Typewriter................ Envelope Machine Inserts Two Inclosures Envelope Stamping and Sealing Machine. Marker Shows Place of Withdrawn Folder Stamp Canceling Machine................ Office Building, State, Planned for Chicago. Office Building, 21 Story, Planned on Site of Old Fort Dearborn Blockhouse........... Office Model, Belgian House Serves as Cee TEE, BORON so oc occ ccccsccnecses Oil Burner, Perfect Combustion Flame = | errr Oil Containers for Service Stations Cee CN ck cweccscesccedcevess Oil Drip Pans Made from Helmets......... Oil Field, Immense New, Discovered in Sub- artic Region of Canada, by Francis Dickie ag tenses Mexican, Self-Propelled Barge re Open-Air, for St. Paul German, to Test Einstein The- eee eee ee ou “rields, Venezuelen, Flying Boats Survey Oil, Floating, Sets River Afire During Flood Oil Gauge, Auto Engine, Signals Shortage. Oil Gauge for Bearings.......... n Oil Grooves in Babbitt Bearings............ Oil ~~ eelantaees Machine for Quantity Produc- | tio Oil Heater Letters, TP GE. Sak cee weceaue Oil Industry Aided by Wor!d’s Largest Tank DP Ccine sesh eeesheeSes Senne ches whee Oil. Lubricating, New Instrument Tests _ cosity of Oil Made from Rubber Seed......... oeeene O11, Old Crankcease, Used as Fuel.........+.. Oil Pumps, Manifold that Reverses Flow for Oil Relieves Coke Shortage in Austria seeee Oil Removed from Waste Water by Concrete weasanas awa or ‘ . . 49 525

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Crconrc wocwr mw A OweN ES NOFOS SCI Sb 6 ln Meat POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Oil, Road Making, Device for Testing Ad- i Me. cont gahs ahha ednnnd baw ed os 391 Oil Ship Bunkers. Four Ships’ at Sea Simul- TMMOCOUBIY 2c cccccccscccccsssccccccccseces 516 Oil, Ship’s, Cost Less Than Nothing.. ae Boe Oil Stove Hood Directs Heat............... 592 Oil Tank Explosion Fractures Chain....... 426 Oil Tank, Self Acting Gauge Records Con- tents of Sec de eC RAEWES FE OKOMETEN OS 6 DO aos 916 Oil Tanks, Fuel, in Aleutian Islands........ 644 Oil Tanks, Ship’s, Cleaned with Air........ 114 Oil, Tractor Crankcase, Attachment for Drawing UAC hAEEKOACCARRRONSG Ree EO ees 292 Oil Truck s carries Tank on Trailer.......... 832 Oil, Used Crankcase, Reclaiming Outfit for.. 827 Oil, en Similar to Gasoline by F rench PO ck kw haben eh es b4 5500005504568 405% 651 Oil Well, Patagonian, Gushes 1300 Barrels 873 Pe ee ee ‘ oi Well Puller Truck "Has Novel Seat...... 253 Oil Well, World’s Most Inaccessible......... 377 = Wells, Gushing, Stopped in Twenty Min- - Oil Wells, Many, Pumped by Single Engine. 582 Oil Wells, Signaling Device for............. 290 Oil-Burning Device Replaces Gas Burners... 644 Oil-Burning Systems, Safety Valve for Fire DE EE ccs cdhincheresdecdés sevesss ce 402 Oilcan Dispenser, Fountain..............5.. 241 Oilean for Spring-Cap Oilers....... a ca 449 Oilcan, Small Forge Made from............ 130 CI, FE 9k 6.5 06.6 6 see ce cece areas de 791 Oil-Killed Vegetation in Orinoco Delta, Air- plane Exploration Trip of................ 408 Oils, Mineral, Best for Wool Processing.... 732 Oilstone, Dull Broaches Improved with..... 123 CRRRS, COMBE cn cecccvreciscccccccsess 777 Cae Eee Card Players, Hand Substitute BE. SA KHK SERRE EES ORCC LOH COC e SLL SOR EECS Onion Sets, Cleaner SS a ene 466 Opera-Glass, Folding Vest Pocket.......... 390 Opera-Glass Spectacles .............-2.005- 579 Operations, Surgical, Motion Picture Camera DEE. bch dune widd eb os we 06 64.0:0 9:0 90's 4.0 one 820 Orange Drinks Made to Order by Soda EE EE ings con ch debe 60s ce es eee wes 744 Orange Peeler, Improved.................. 915 Orange Tree, Pioneer, eases by Young PE Hie iesDacadhek rahe sn edaors rc heeand ey 94 Orchard Phonograph Fights Thieves....... 656 Orchestral Composition Contest Open to American ComposerS ........esseeee000. 479 Order Pad, Outdoor, Pan Protects........... 933 Organ, Pipe, Installed ved Concerts Then “aole ab ba k.+ 6 died ara. 6 Ones sos on 6.6 oan is 354 Organist, 72 Year Church, a Popular Me- GUOMIGS BUDOCTIDOS 2c cccccccccccccccccess 320 Oscillophore. Blood Parentage Determined with, by Albert Abrams..............006. 9 Ouija, Automatic, Answers Health Questions 571 Ovens, Electric, for Picnic Park............ 29 Oxyacetylene Blowpipe Lit Under Water. 254 Oxyacetylene Hole Burning in Concrete. 438 Oxygen and Acetylene Plant in The Kion- ee ee oe oaks a ROSA a beable eamee 392 Oxygen Cylinder Valves, Opening.......... 302 Oxygen — abel Divided, Oxidize Paraf- Serre eres ee 110 Oxygen Supply Controlled by Heat Leaking OR RE rrr 602 Oxygen Tanks, Roller Truck for............ 926 Oxygen Valves Should Be Examined....... 452 Package Month, wweseet, Stimulates Proper ee err 919 Packet Comes Back, ‘The, by H. H. Dunn. 385 Pad, Inking, for Rubber DORM... wc caccscs 383 Pad. Outdoor Order, Pan Protects.......... 933 Paddle Wheel, Stern, River Boat Can Adjust 119 Paddles, Collapsible, for Swimming......... 341 Padlock Hasp, Screwless.............+.0005 293 Pads, Auto-Seat, Cleanable................. 265 Pads, Horseshoe, Made from Old Tires..... 625 Page Fastening in Loose Leaf Binders...... 777 Pail and Strainer for Kitchen Refuse....... 432 Pail Hook, Easily Operated................. 612 Pail—Refuse Receiver —_ PRBOOMOM sc ccasces 272 a ache Cenc eae ewe eeebse eos 620 Paint, Automobile Tire..............0+.565- 304 Paint Making by First. Powsertag ee Fe 917 Paint, Old, Removing. . Paint Remover, Liquid Paint Required for Given Surface........ ; 937 Paint Spraying, Interesting Facts About. 515 Painting a Seagoing Salvage Barge........ 230 PS Gee Bn 6b 64 died dscccvadesseece Pee TEs BOOBs oc ceccccesscncenseeese Paintings, Old, Device Shows Original Col- SE sk ceccriwcscescecscrctoaccesccaseseue Palestine Project, Big, Government Under- ak a wid Chale at's at Gale a ein a aas a eee ae Palmblad, Carl: Aeronautics Affect Electric RG cee ee a aie 2 ahah aie cise & Pan for Boiling Meat Over Ope n Burner. Pan Lifter for Pressure Cooker............. Pan Protects Outdoor Order Pad Pan Scraper, Nickel Plated.........c.ccecees Panels, Dining Room, Window Shutters as.. Panels, Screen Counter, Prevent Drafts..... Pans, Oil Drip, Helmets Used as............ Paper Files, New Way of Preserving Paper Making from Hardwood Pulp....... Paper Making Machine, World's Smallest... Paper Mill, Experimental, Siamese Govern- Ty De cp eekdnerehb es b4s SOCK OA AOR REDS Paper Mill Planned to Utilize *hicago's Pe PE ces b en edd CdR ced oodenqacezee Paper Negatives Displaces Glass........... Paper, Oil, Umbrella Made of.............. Paper, Salt and Pepper Shakers Made of... Papet, Special, Cement and Lime Bags Made Makin Paper, Translucent, Paper Waste, ER ee ee re Parachute Accident, Rumaway.............. Parachute, Airplane Propeller Draft Tests.. Parachute Lifts Passenger Cabin from Dis- abled Plane Parade, Missouri, Depicts Old Times........ g Paraffin, Finley Divided Oxygen Jets Oxidizes Parasites Used to Kill Flies............... Parcel Post Mail Truck, Carriers’.......... Parcel Strap Buckle Has Tag-Attaching Clip Parentage, Blood Vibrations Determine, by I I as coal ke arin: WV bo eo cdi ob de Park, City, Firemen Found and Maintain, by Sc ai), a dela Ge ci te acta se ah. wo, ww Park—Marking Mt. McKinley.............. Park, Picnic, Has Electric Oven and Hot PE, Sc cka a ue Ad eee aes Odo bbe d2deee Park Replaces Penitentiary at Baton Rouge, Lt anedkcbntsea ached aa ah ae aebedie'e Park Rules Protected with Wire Screens.. Park, San Francisco, Has Kiddie Ride...... Park, Sequoia, Preserves Largest of Red- ,.. ..... AAS eee “Parking All Day” § Danek nnveetin Akh bakwe sen dabedewsare Pe BND, BUIGs nso cc ciccncessecesarces Parking Light and Mirror, Auto Signal is. Parrot Propels Toy Tricycle..........0..... Parting Tool, Multiple..................... Partitions, Wall, of New Flexible Material. Paste Filler for Hardwood Floors.......... Pee “EU PC OTGG es coc ccaccasccscecscecs Patches, Lifelike Posters Made of.......... Pattern Marker, Compasslike, for Lawns... Patternmaker’s Roughing Scraper PUR COP COE OS ROG cccccccrscscwsvrrececere Patterns, Multiple, Cut by Machine......... Paul, Geo. F.: Automobile, Manchurian a re Gyroscopes, Giant, Stabilize Ocean Liners. Hydraulic Jump Prevents Flood-Water Re Pah eie ase tS pin a hes wwe area aie Pavement Finishing, Concrete.............. Pavillion for Stockmen Proves Profitable... Pearls Made from Scales of Herring....... Peat Bricks, Swedish Government Subsidize CS eer are area Pedal Onerates Drum Snares and Cymbals. Pedals, Bent Auto, a Convenience Pedrose, Lawrence William: “a Farm, Convict-Operated, Wones | OO SERRE EEO SE ear Irrigation Ditches Cause Stupendous Loss Snoqualmie Pass, Oneninge, with Steam. Snubber, Efficient Log-Train, Has Novel Dt hee uitdensaeeskebnees wedue eee eins ok bw lbe a dee ee wee sO oe we ee TO ST, TUIOMEN co coca cccccccececes Pen Drawing from Photographs........... Pen, Fountain, Pump-Action............... Pen, Ruling. as Ink Braser.............+.. Pencil, Refillable, Clearing The Point of.... Governor's, is 786 Chienge’s, Mill Makes Mews. > 252 871 545 790

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28 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Pencil Sharpener for Pedestrians.......... Pencil Sharpener, Motor-Driven............ Pench) BRATHeRST, BIMAPle. . oc ccscccccsescace PONG, BEOCre POM FOF. cc scccvcvsvensene Penitentiary, Baton Rouge, Supplanted by SIOUROEMIEY CORGOP PEFR .cccccscceccecvcs Pennies Elevate Motion Picture Seats...... Penny, Simplicity Tax, for Sales Tax....... Pennywort Classed Among Weeds......... Pepper and Salt Shaker Combination Ex- i i oc OLA wedwes e0.sa ceo b ode Percolator Steam-Heating Boiler........... Perfume Burning Electric Lamp............ SE iis pao A See Dee dO ewes + we Pheasant Farm Operated by Convicts, by Lawrence William Pedrose............+.. Phonograph and Camera in One............ Phonograph as Banding Wheel............% Phonograph, Darky'’s, Tambourine on...... Phonograph Fights Orchard Thieves....... Phonograph Fitment Shows Views Illustrat- NE Sind a-ha wie aay Kw ee Re BRON we A we Be Phonograph in Central Panel of Cabinet Phonograph, Light Playing, Contains Rheo- CE CR GS bone Oe ee A Oa eee ee eb ee wie 8 Phonograph Motor, Noiseless Electric....... Phonograph, Multiple Record............ ; Phonograph Music by Radio................ Phonograph Needle Plays Many Records... Phonograph Needle, Tubular ............... Phonograph Needles Picked up by VPoint- SE NE ig nick encase wa res cK S80 94.0 Phonograph Plays a Multiple of Records. Phonograph Record Brush Follows Needle. Phonograph Record Cleaner, Automatic..... Phonograph Records, Filing.............0.6. Phonograph Records, Warped, Flattening.. Phonograph Repeater, New Simple......... Phonograph, Toy, Plays Small Records Phonograph V ibrating Disk Preserves Tones 5 Phonographic Suitcase, Wireless, Reproduces PG MO vis petgas dese vad wsd Heeew as Phosphorus Extraction from Ores.. Photograph, Airplane, of “Smoking Moun- I tatgrar toa. Sra aie a eg Us Ae duke ated a a alte ate Photograph of Motor Truck Fleet........ ‘ Photograph Proofs, Numbering............ Photograph, Remarkable, of Falling Church BRS re a reer ei mein ate ae Photograph that Depends upon The Point of NS oie aleg ine alin Baan WG: toa rd, oak we alle ar deen ei Photographers, Movie, Transform Nature... Photographs, Diffused-Focus .............. Photographs for Newspaper Reproduction, co eS ES eee ee ee Photographs on Canvas, Mounting.......... Photographs, Pen Drawing from........... Photographs Teach Language in Correspon- a a ra ip sbiblkie iis. arate Re ik mm boas eon Photography: Dirigible “R-33" and Surrounding Coun- PR a re een a Earthquakes Recorded Photographically.. Film Stripping from Old Negatives...... Finger Prints Amplified by X-Ray....... Flash Lamp, Folding Portable........... Lens, Iridescence on ............ Sache statin Negative Scratches, Removing ........... Negatives, Glass, Paper Substitute for.... Negatives, Wet, Enlarging ............6. Photograph Mounting on Canvas......... Photographs, Diffused-Focus ............ Planet “Venus” Photographed in Daylight Portrait, Photographic, World's Largest.. Print Washer, Improved Drive eee eee Printing Deivce, Rapid Photograph...... Prints, Contrasty, from Flat Negatives... Prints, Dipping Solution Preserves....... Prints, Glossy, Ferrotyping............... Prints Prevented from Slipping eee, WOR, SWUMRMOME ooo sok cascsuvexsés Proofs, Photograph, Numbering Rack for Deveolping Cut Film.......... Retouching Screen Saves Much Labor.... Snowflakes, Photographing .............. Switch, Dark Room, Identifying.......... Studio Light Re ‘gulated by Triple Current NEM ac wince 4a Atwell cA Wk Gadd KGa ae Gk Yelloystone Park Photographed at Night, eS eS rarer rem Phrase Prize Describing Edison P honograph Physical Training—-Swimming Exercise for CTIGTOR ..0 PR ee eae ts 578 Picture Stories for Children ............... aN ied: ine ae Wie re Bs 120, 280, 440, 600, 760, 920 Picture that Depends upon The Point of View 260 Picture, Window View in Hotel Looks Like. 909 Pictures, Signboard, Suggest Civic Improve- DEER. hassdcnsd sd nccas vase knee sh enkedes eeew 546 Pier Construction Work, Unusual......... 427 Piers, Fishing and Amusement, Side by Side. 568 Piledriver and Flat Car Lifted 100 Feet by ye re ee rer re er eer rire Peete 861 Piles, Concrete, Bamboo Reinforcement for. 511 Pillows, Milkweed Silk for Stuffing......... 951 Pinch Bar Made Safe to Handle............ 619 Pineapple Fiber, Machine for Separating... 210 Po EE awe wan aes hee odes we eo 605 Pins, Small, Grinding Fixture for........... 935 Pins, Worn Wrist, Expanding ............. 452 Pipe Bending Machine, Power Driven....... 882 Pipe, Broken Drive, Removing ............. 776 Pipe Fittings, Tower Bridge eproduced RES a a ee ae ery ae ae 365 Pipe, Discharge, Stoppage Alarm for....... 777 Pipe Joining, Lead, to Wrought Iron....... 770 Pipe Joint, Flexible, for Angle Flow........ 747 Pipe, Lead, Preventing Water Action on.... 131 Pipe, Old, Aids Fence Building ............ 317 Pipe Organ Installed for Concerts Then ERP rea TE Pe Teer Cre eee 354 Pipe, Suction, Keeping Air Out of......... 939 Pipe, Water, Magnesia Deposit Cloggs...... 529 Pipes, Frozen, Thawed Electrically......... 766 Pipes, Underground Sewer, Degree of Bend PE ntibseGstc cheats ant eeeaknss dea bbs eeree 459 Pees EOP Terre THOOG. < ccccieccescssessss 58 a ee arr rrrrrr er a ae Pistol, Slaughtering, Kills Humanely...... 23 Piston Ring as Bearing Scraper............ 445 Piston Hing Removing Tool. ...6cscsccccnss 434 Piston Rings Clamped for Turning......... 140 Piston Rings Removed with Cloth Strips... 946 Piston, Two Piece, Made of Aluminum and Ig is ares ei ors eee 756 Pitching Cannon, Ball, Tests Players’ Skill. 346 Pitching Machine, Baseball, Uses Compressed mee, OE POO TE. FeO NGi css dowd cecsncees 703 Plane, Plow, Converted into Router......... 141 Planer, Road, for Leveling Rough Roads... 59 Planet “Venus” Photographed in Daylight.. 346 Planets Appear as Points of Light in The Largest Telescopes, by C. A. Brigges...... 442 Planks, Wood, Displace Steel Sides of I RE, is le aly nb Aiea wie ae ak ak ee 238 Plans, All-Shingled House, Prizes for....... 640 Plant Covers, Helmets Used as............. 955 a et oS BSR A ee eer 152 Plant Sprayer Sprays under The Leaves... 397 Peewee Wee, ABTORNe oo cvasccceeseccssens 272 Cae “eee, COG TOE cc cscccsascwecis 208 Plants: Air Plant Interferes with Electrical Ap- EE Pe een ee ee Se ee ee 738 Bur, Puncture, is New Pest for Motorists. 542 Cereus, Night-Blooming, Hedge Made of.. 748 Hemp Growing for Longer Fiber......... 896 Henbane Grown as Neuralgia Drug...... 736 Milkweed Silk for Stuffing Pillows....... 951 Pennywort Classified as Weed........... 7 Water Hyacinth Fought with Steam...... 683 Plaster, Adhesive, Used to Attach Shades to UN ot ry le eel oh one vi cn i ie Tarp 311 Plaster Molds, How to Make...........ee..- 147 Plastometer Reveals Moral Character....... 482 le OR a eee aa eee 771 Plate Separators, Battery, Tool Inserts.... 271 Plate Steel Sheeting Pulled into Place by NIN Sarat cicciiu deca essdeln nM ins aos allan ich Gri ee eX Se 110 Plates, Segmental, Turning ............... 289 Platform, Adjustable, for Combating Dock RR ee ire ne ae 72 Platform, Auto, for Movie Camera........%. 711 Platform on Truck for Changing Wheels ESR. acd n'a ak ai Ob dae waa Sec a 645 Platoons, Infantry, Concerning Prizes Offered Stories

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POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Play Combination is Slide, Coaster, Seesaw, Trapeze, and Merry-Go-Round........... Playground, Ferryboat Swimming Pool is. Plier Jaw Attachment Fits Irregular OE sce nr ban teeeke tides booed SO Ca we Pliers, End Cutting, Gauge for............. Pliers for Ball Bearing Rings............... Pliers for Removing Insulation Pliers for Tack Driving Plow Plane Converted into Router Plow, Underwater, Opens Shipping Channels, ers Ws SS 5 os 0-0 on 0 0.6.5:092.54660005 Plug, Attachment, Easily Repaired......... Ome BERD BEMIS POGOG sos cccccswscisscasss Plumbing: Faucet Attachment Mixes Hot and Cold | REE Per eee ere re Faucet, Emergency Installations, Plumbing, Motion Pictures Lead, Preventing Water Action on. Pipes, Lead and Iron, Joining........... Pump, Camping, How to Make.......... a ee ara eee 27, 286, Pump Valves, Setting Duplex............ Soldering, Quick Method of.............. Wiping Solder and Babbitt........csscess Pocketbook Catch, Adjustable, pO a rrr ree err Poem—Civil Engineer, by Lydia M. D. O'Neil Poem—"“The Four Winds,” Prize Cffered The of Pipe, BOOM PEURICRE BOT Ghiinvcccctvcciueoas Poison and Honey Compound Used to Kill PGE. Fi baedateeina tees eked Dees ae Pole, North, Wandering of, by C. A. Briggs Pole Over Water, Greased, is Great College SIN i ke hhn mata aa bake aad. one eee oe as eh lS eae Poles, Telephone, Preserved with Sheet PRIN SENN Salat Sm cinta ele as'd ce ads RS ela — . Wooden, New Preservative Prolongs MEO GE cc ee ce vrie creer bese sicvesrertersesevess Police, Bullet- Proof Jacket for. Ce Ae ae Police Department—Signal Stations for Cap- turing Escaping Criminals..........c.cccses Police Monument to Dead Heroes...... Police Post, Farthest North, in Arctic C ircle Policemen Harried by Tear Gas............ Polishing Nuts, Saving Time When....... POMTCOM TORE, BACON s «oss one dnccscscasees Pontoon Bridge Built of Wooden Ships..... Pool, Swimming, Madison Square Garden.. Poplar Tree, Bird Houses Mounted Popular Mechanics Subscriber 72 Rn GENIE ss ahr us elk Sian 6 6oda a6 deo & Porcelain, Broken, Cement for.. Porch Balusters Duplicated in Lathe........ Port at Genoa, Italy to Be Immensely Ex- re a EE ear te - Port, Marseilles, Size of, to Be Doubled.... Portiere, Wood, Carved with Penknife Portrait, Photographic, Ports—Shipping OResccsss Years a World's Largest... Posts for Northern Siberia POR TTWOT, REOMNOMNRDS coins occ caddies» Post Office Appliance—Springless Accuraté Letter Scale Post Office Appliance—Truck for Parcel se, Ore ee Post Office Department—Mail Routes, Air- plane, Except Transcontinental to Be Dis- TR eet er eee Post Office Employes Armed to Stop Mail PN £3. .a8 Scan waa nwa kas G60 a Sb ae 2b co ee ee eee Postal Service, Auto, in Finnish saanene Postcard Views Aid City Boosting...... - Poster and Advertising Display Stand...... Posters, Lifelike, Made of Patches....... Posts, Cement, Attaching Wires to Posts, Fence, Made of Tufa Rock..... Posts, Guide, for Tourists in Redweod For- SE ich ith aie edna ean ee ek he kee seed een Posts, Hitching, for Automobiles.......... Posts, Mine, Steel Channel Posts, Round and Split, Posts, Shipping, Potash Ponds, Durability of...... in Northern Siberia........ Evaporation Forced at...... Potato Curls, Twisting Screw for Making. Potato Peeler that Scrubs The Skin........ POUMry TeOUss, CIOANSF FOF... o cs cccancvevcs Powder, Flashless, Developed by Army perts Power, Nighttime, Power Plant, Stored for Daytime Use Farm, Automobile AS.wccsees ee eee) Ted we We Oots IMAI wo ro" to { _ de 480 159 16 P 922 99 845 269 909 R656 Power Plant, Multiple-Unit, for French Air- SE ost d ac edebesdiaeeaSeaseent se gebawee Power Plant, Portable, Gas Engine Makes. Power, Volcanic, to Be Used in Hawaiian DP. siesenvctise ddan whe WehRAe ne dew ee Prayer, Lord's, on Tiny Printing Slug...... Perambulator Has Extra Seat for Next pf ererrrreorr er rirvirrrreri yer Precipitator, Electric, Takes Dust from PEE scansrccesane sdasetavebenee ben eh be Presbyterians, Welsh Philadelphia Have Bisteddfods Annually ...ccccccassccvecess Preservative, New, Prolongs Life of Wooden PE! cdvva ceudd Cai nie EweAae CANS Saad eee Press, Arbor, Air Operated, Works with One Pe oo. .ccat evades wash a eeeeeaa kewe en Pees, Misctsia THOUS | 100s ctssvesavcvivnres Press, Power, Aids in Making Swiss Cheese Press, Soda Fountain, Makes Orange Drinks PPT TP eT Crrirerrieicricl Te Pricker, Serviceable Drafting........... Print Shop on Ocean-Going Steamship Print Washer, Improved Drive.. , Print Washer, Simple ....cccecrssvves Printing, Imitation Embossed. . Printing Machine, Rapid Photograph. Printing, Private Money, Proves a Swindle Prints, Ferrotyping Glossy .......5.4.5. Prints, Making Contrasty, from ‘Flat Nega Ee eee arr err wees : Prints, Photo, Dipping Solution Preserves Prints Prevented from Slipping........ Prints, Trimming Wet ....csccsescs Prize Offers: City Service, Greatest......... ‘ Economical Suggestion, Prize Awarded Sy ae. ee” Serr sree ee ds Essay on Contributions of Jews to BMygiene .....s. Essays, American History. » aisle Essays by Enlisted Men. ‘ Cruelty of Trapping.. Essays. PEOTOGIEY cicwssvcves Fruit Exhibit .. Helicopter Demonstration Home Life, Best Tr , , Horsesh o¢ Pitching ‘Tournament House Plans and Photos, All-Shingled Infantry Platoons, Stories Concerning Limerick, Fifth Line Magazine Contributions Mural Design .......... Mystery Solutions “* News-Times’ Prize, Novel, “I Saw Your Advertisement,” is Novel and Story, Canadian Oil Heater Letters .. Photographs for Ne wspape r Reproduction Phrase Describing Edison Phonograph Piano and String Quintet Poem—“The Four Winds,” Musical Set ting of ° Public Service, Distinguished Pulitzer Prizes and Award: Annually Scholarship Safety First Essays by Children Safety First Essays by Teachers Sale Story Scenario Contest Stories, Short Word-Building Contest Producer, Diminutive Gas, Cast in One Piece Producer Gas on Auto Truck Reduces Cost Projector, Daylight, Uses No Slides Propeller Blades, Large, Grinder with Flex ible Shaft Grinds Propeller, Molde d-Fabriec ‘Airp ‘lane, is Warp a. Seer eee . Propeller Pistol ous Propeller with Blades Propellers, Ship, Improved Rb iihdiek Siiebete dak Ohta ale Set es (mee Propellers, ‘Shrouded Screw Props, Mine, Steel Channel... Prosperity in Sight, by H. H Protector, Bullet-Proof, for Prunes Treated by New Apparatus premereeest - Method of Cast Windsor. Police Public Service, Woodrow Wilson Prizes for Pulitzer Prizes and Scholarship Awarded AEROBIE cic chee weudweesvarnevern : Pulitzer Trophy Airplane Race, Second An- nual POTTY Te Cer eT Te Pulley, (¢ ‘lothesline, Automatic ally Cleans Dirt from Line

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sv POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Pulleys on Face Grinding Machine, Attach- Ee err ere ee er eee Pulp Decay, Wood, Prevented-by ‘Antiseptics Pulp, Hardwood, for Paper Making........ Pump, Air Power, Uses One Float......... Pump Automatically Serves Hard or Soft Water EG an aches ae SW lovee i ww ae wma nm Sin for Launch Electrically Oper- ER Are ree err re Pump, Cooling System, Makes IS Sees car at wales a sipsha Widmtna weld ne Pump, Grease, and Bucket for Private Gar- Dn) Se uh esas bees bok Sa dee CEw ORO DOW Sd OO Pump, Homemade, for Camp Use.......... Pump, Oil, Manifold that Reverses Flow for Pump, Positive Rotary, Employs Novel tage Scatter al rset Wim’ cau a” lac caaiite! walt ne ore Pump, Road Building, Old Fire Engine Used ee ate AS lis = Gace Wales Waa ware eae See Pump, Roller Tire, for Autos Rist aide ate sate nie oo es eer rrr 27, 286, Pump Valves, Duplex, Setting............. wumnm Valves Madge Tight..........ccccoess i MO Di eeOPRe obo acc ccc vevces vaeee Punch, Hollow, Automatic Ejector for..... Punch, Sheet Metal, for Tinners........... Puppet Shows Delight English Children... Purse—Rosebud Top Bag.............. hae Purse, Silk, Made from Sow’'s Ear......... Putty, Softening Hard een” Ladrsceaciatnonneeweeers Quadruped with Two Legs................- Quarrying, Compressed Air, Novel Method Ee eae eer ee rer ae eee Quarrying—Granite Block, Record Size.... Quartz Establish Radio Wave-Length oneness, bY C. A. BRISOE... ccc casccies« Gut Made of “Kapok” Piber......cccccsoss Rabbit Target, Somersaulting ............. Rabies in Chicago, Stamping Out, by Robert H. Moulton Seats Ge: are, cee ern We abate hr tes dual Race, Aeroplane, ( ‘olleges Compete in...... Race, Motorcycle Sidecar ...........ccceees Race, Pulitzer Airplane, Second Annual.... Race, Road Rollers Stage Race, 1200 Mile, Motorboat Defeats Train in DGG BEPHRCS, FUUMDSTH ...cccccddesvivvcs Racing, Motorcycle Ice, Ski Stabilizers for. Racing Motorcycles Started by Towing..... Pn, Drewes. £0F BIN 2c cciccvcicvcscoencs Rack for Developing Cut Film Rack for Displaying Electric Light Bulbs.. Rack, Handy, for Kitchen, Bathroom, Nurs- rier ek eek ip heh wim eek pe age baew eo Rack, Illuminated Advertising ............. Rack, Portable, Supports Temporary Elec- SE Sa uk toni 9, Aw wh ee a ebm ae Rack, Rustic Bicycle, is Park Convenience... Rack Teeth, Lathe Used to Cut............. Racks, Convenient, for Exhibiting Heavy eh wi Ge Mialaleds eka wane Aw oe Rese eae ne BOG, SPR WORE cnc cccicccvescdonawe Radiator Cap, Electric Bulbs Displace Knobs TEE a ae Radiator, Engine Flyw heel Radiator Funnel, Automobile...... Radiator Valve, Auto, Prevents F reezing. Radiator, Ventilating Steam, Supplies Heated >, i aS a eer ns See Radiators, Automobile, Quick Detachable. Radiators, Testing Automobile .......... Radiators, Tubular, for Autos Made of Me- re ee ot Gg Ok wade sae e ee wee Radii, Cutting Accurate, with Lathe Tool. Radioscopic Examination of Mind and B ody. Radium Found in The Congo.............. Radium Gives Coloring to Gem Stones...... Radium in Box Presented to Mme. Curie.... Radium Supply, World's. Not Known Radius Finder for Draftsmen Radius Gauge Holder meet. Airplane Late .. 2... Rafts, Life, for California Docks mes Huge, Making .......... Rail, Old, Sulphur Print Discloses Construe- EE Sree eee Railroad Pumper, End-of-Track, Gradually . Railroad Car Cl: amp Binds Wheel to Rail. Improved. Stops Cars Railroad Car Journal Bearings, 368 237 Railroad Cars, Czecho-Slovak, Decorated i DL pacadkeciceneoun ev eierencswedes 875 Railroad Cars, Staggard Roller Bearings for 421 tailroad—Coupler, Automatic Car and Hose 815 tailroad Crossing, Flexible Barrier for..... 831 Railroad Crossing Sign, Wrecked Auto is... 63 failroad Dump Car, Air, with Extension DE: ocnegnese sve ek hae & aus aman eee ae ae 836 Railroad Electrification by “Jugoslavia Gov- CD canto sae kekdeenane ends ar canes 650 tailroad—Freight Car, Hand Lever rake ee ne ee erry err re hee 382 tailroad—Freight Cars, Rachet Hand Brakes SOT - cé-vts dents acieenatibs be tba e seen eda une 880 tailroad Labor Housed in Tie Huts........ 715 Railroad—Locomotive Dragged from Mud [Sate BF GIR COORG in o0 cr csancaseveess 514 Railroad—Locomotive Slide Valve Changed CP Pere WOOO. 6c cdesnceeseceiunsdaesens 573 Railroad—Locomotives, Earliest and Latest Ci, eer er ee er ene 25 Railroad—-Log Train Snubber, Novel Fea- tures of, by Lawrence William Pedrose... 178 Railroad Mails Cards to Careless Motorists. 438 Railroad, Miniature, for The Back Yard.... 855 Railroad Motor Trucks, Steering Wheel Ap- a ORE Cr rer er rae 913 Railroad—Refrigerator Cars, Temperature PPROOTEIEE DOVIOS FOP «div dkscvccvccsancane 894 Railroad Signal Duplicated for Foggy IS ia crea aaiae Giang Ghai ae eid aie be 860 Railroad Sleeper, Extra Ventilation in Low- ee is Gs a ccs see bene wo hacatae dee a 935 Railroad, St. Paul, Has Open-Air Observa- ee FER a ee 492 Railroad Station, Chicago, Train-Shed Model Ect sicks Juice onto a Ok ah ka Oe aaa 417 Railroad—Stations Announced by Electric ERA Tara is Speen pn paees 337 Railroad Stations, Illuminated Double NN INE i sea hin beh eae ae oe ow wr ars a ae 108 Railroad, Strange, for River-Boat Portage in The Congo, by Henry S. White........ 495 rint Discloses Construc- wt. S.C Re eer 78 Railroad Track Built under Water Tank to BR ee ee a ae 481 Railroad Track Weed Burner .............. 237 Railroad Tracklaying in Freezing Weather. 586 Railroad, Tractor Operated, Between Chesa- peake Beach and North Beach, Maryland. 908 tailroad, Transandean, Winter Handicap of. 797 Railroad—tTruck, Steam Motor, as Switch PE Lon cascade ake ne each wae ea wes a wslek 575 Railroad, Tube, Proposed for Calcutta, India 566 Railroad—Wheels, Self-Adjustable, for Dif- Sev. eee SEER Acandonanseneceace ann be 249 Railroad—Wood Planks Displace Steel Sides ee SO. ane wn cad Os HA doe he eee 238 Railroad Wreck—Freight Cars, Eighteen, in NON as crag dl clas Sid ee ak a ew meth mew wid a 839 Railroads, Steel Freight Containers for..... 31 Raincoat Mending, Adhesive Tape for...... 146 Rake, Mechanical, Picks Up Apples......... 356 Rake, Sectional Garden, May Be Widened... 184 Range-Finder Sight, Rifle, Used with Both Ree e rere cee Tere er eee 725 tat Trap, Hawser, Catches and Cages Rats. 383 Rats Foiled by Tin Ring on Cocoanut Palms 57! Rawhide for Repairing Snowshoes.......... 792 Razor Blade Pencil Sharpener ..........+.- 314 tazor Blade Sharpener Has Automatic Feed 868 Razor Blade Sharpening, New Slide Holder OE cp chi verd ssa wWaiee MLR RAke ERO Deena he 23 Razor Blade Stropper, Rapid Electric...... 52 ReapOr HinGes, FIADGICS FOF ..ccccsvccceccses 3il PeBOP THOMSON, ClORMIRE oo ccc as ccovesineses 777 Razor, Old, Straimhtedge Made from........ 934 rasor, Safety, Disk Stropper ..ccccccvcseoce 431 TEMBOT, BALOCY, TOAPTOVCE oc nccccscvcscsdces 186 Reamer, Adjustable, with Micrometer Ad- DO ceckhiste as chwe nea news eee chs oak S 27 Reamer for Babbitt Bearings.............. 77 Reamer Holder and Drill. Self-Centering 594 weOemIees, Piemibie Shalt FOF... ..ccccececcrs 426 Reaming Small Oversize Holes............- 299 Rear-Deck Extension for Coupé............ 283 Receiver, French Wireless, Made up of “Ra- i. nn iad. oe a ea ord ww hae k Mba a sa Sue R21 Receiving Set, Radio, Weighs Five Pounds. 591 Receiving Tuner. Space-Saving ............ 155 teclaiming Outfit for Used Crankcase Oil... 827 tecord Brush, Phonograph, Follows Needle 244 Record Cleaner, Automatic Phonograph .... 844 Records, Warped Phonograph, Flattening... 957 ee a ee ee. ee Ged feed feed eed

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POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Ressesns Instrument Tells of Machine Stop- pag malebense Tables, Mounting teflector Fixture, Multiple, Brightens Coun- CFP TOORGe .csecccuses Seah eA Gach om, lmao as Reflector, Simple B icycle — “Refresher Courses” for Veteran tefrigerator Car Temperature REDS. éccteecabeketeWaeGeenttestinraen ©e Refrigerator Ice Preserver Prevents Waste- ful Melting Refrigerator, Refuse, ‘Airmen. ° Recording Meat, is Also Counter........ Kitchen, Pail and Strainer for...... tefuse Receiver for Kitchen Refuse Truck for Detroit Registering Device Body in Action for Study of Human telays, Mercury Overload, Protect Small ORE Ene ty pee Fee Reorganization Period, by H. H. Windsor. Repair Insurance, Auto, Garage Gives...... Repeater, New Phonograph ..... Reproducer, Loud Speaking, DOE, Se i ks ee cboss vues bbenwecne® Reproducing Drawings Economically Reptile Lake Reptile rrr Reptile Killing Reservoir, Storage, Overflow Reservoirs, Construct Uses Rigid Pa- —Alligator, Baby, Captured in Indian Fossil, Resistence Box, Improved Features of...... Resistence Units Made from Film Spools... Rest Room Conning Tower on Roof of Office SIN = <5 cn wa tasiesid a ied alc ies ee as om es a Restaurant, Open-Air, Has Parking Spaces ge ee rere Restaurant Tables SupEee with Papers as Ss 8 RS ear ae Retouching Screen, RE. CE. ori n'a ny Wiel oh ais hata ee teunion of Farmers’ Wives is Pleasantly | Re ea ae ee ae aS Rheostat, Arc. Electric ‘Iron Rs a nw hades Rheostat for Light Plaving Music.......... Ride, Kiddie, in San Francisco Park Riding Device for Dance Floor............. Rifle Range-Finder Sight Used with Both Ree ee ee Rifle Sighting Ability. Testing Right and Left Handedness, Curious Facts PE 5's sd hd Sass le ah a eae ew asl Rim Anvil Repairs Bent Auto Rims........ Rim Lug, Improved Automobile Rim, Tire, Bead Reformer............... Rim, Tire, Quick-Chanmg@ing «......ccscscvece Ring Gear, Flvwwheel. Changeable Ring, Spacer. for Roller Bearings Rings, Ball Bearing, Pliers for Rings, Gymnasium Rings, Piston, Rings, Stolen, Removed with Cloth Strips.. Discovered in Woman by DE. Bthaesceediwtauewiend o6 ad dba cae aes Rinser, Bottle, Fits on Faucet...........-.-- River Afire by Floating Oil During Flood... River Roat Portage in The Congo, by Henry a. White ... River, Grand, Renamed River, Mad. Harne ssed in a Reclaimed Des- sert, bv John Fdwin Hoge River. New South Wales, 3ridge Spans River Overflow, oe RF I Oe ae ee eae TA Riveter, Hand Gun Road, Automobile, Timber Cleared of Snow by Steam Shovel. by Lawrence William Pedrose.... Road, Flectrical Moving. Proposed in Janan. Road, Fine. Built for Freight Traffic Only, by Emmett Campbell Hall .............. Road Grader. Rotary Disk Road Laws Forced Road Making Oil. ne oo BSE rrr eae eee Road Paving Blocks. Cast Tron Road, Perfect, One Mile Of ....ccccccscesce Road Planer and Scarifer for Leveling Rough EER rr eS ere Road Rollers, Steam and Gas-Engine, Stage ME pxtiakiaknineateGh Se enhsn wn Oe mech eee a Road, Scenic Mountain, Blasted ‘from Cliffs, by Frederic Kinney upon Eastern States.... Device for Testing Adhe- 194 136 894 746 894 605 Road Signs, New, Courtesies Fostered by. Road Subgrade Machine Cuts Mechanically BH ncseheetecrudns Cass aedsens been seehan Roadbuilding in Morocco .........25-.ee08. Roadbuilding, Instrument Tests Subgrade SOR cect hemndde ddbe Seda veercnrbbcesiavees Roadbuilding, Old Fire Engine Used for.... Roadbuilding Rock Tested by Impact Ma- GG 5.09065 0 ces ueeanseeedessss Roadbuilding—Slate Waste as Asp yhi lt Fille r Roadhouse, Curious, Noted for Chicken Din- BOTH. csc eas ewe essa sse dri eescenatasevesveve Roadside Stands Erected at Sm: ill Cost ve Roads—Canadian Route to Pacific Now Open Roads. Country, Multiple Reflector Fixture EO. bcd as ehdibbe esse wneeees Roads, Good, Essay Contest on. pale ticee Roads, Imperial Valley, Paved with Cotton. Roads, National Forest, Blazed with Air- i, a) eee Rock Tested by Impact Mac hine. wae aa a Rock, Volcanic-Ash, Handled Like Lu mbes DY EROTRCH TE. TROIS .ccccsscvcsevcsvcvers Rock. Water Chisels Letters from. oe aa abi Rocking-Horse-Kiddie Car that Jumps Rods, Welding Short, Proves Profitable: “Roll of Honor,” Illuminated, by H. H. W ind- OE ee en eee Pe eee ee , Roller, Removable, for Fishing Rod Tip... Rollers, Antifriction, for Drawers.......... Rollers Guide Cable Cars Around Curve Rollers, Road, Steam and Gas-Engine, St: ige Race Rollers, R ubber, Making faekwwe oe sl Roof. Pneumatic, Transforms Lawn into Theater, bv Henry S. White..... Roof Truss Placed Quickly .. adiwe ai “e Roofs, Small, Protect Trout Hatchery Pools Rooms, Couthouse, for Jury Women....... Rope Cable is Size Record Breaker.... Roughing Scraper, Patternmakers’ Router, Plow Plane Converted ney Rubber Filler Made of Pulverized Tufa “Roc k Rubber Mat, Safety, for Bathtub Rubber Nursing Bottle, Sanitary FEUDS! FEOLSOTS, DOMMIGS esc cccesoessccosees Rubber Seed Utilized for Oil............. Rubber Stamp Inking Pad . home carn Rubber Strip Mends Worn Tire Treads Rubber Tread for Endless Tread Tractors tubber Tube for SwimMinG....ccccsccccvccs Rugs, Clothespin for ........ aaabaondla tues Heavy, Exhibited on Convenient a! PP TeT TC CT Tr CT eT TT TET Rugs, Making +r ce . ’ Ruins of Opprau Dve Works Explosion , Rule, Slide. No Balloon bribed Complete with- out, by C. A. Briges .. —— Rule Solves Lathe-Work ‘Prob let ms Rule, Spacing, for Typewrit:« Ruler, Parallel, Runner, Swivel, for Harrow. ‘ Runners, Auto Sleigh, Making.. ' Runway, Inclined, for Greasing Automobiles Runway, Small Auto, for Curbs.... for taaunand Sack Tying Machine, Safe Lock, Auxiliary Safety First: Cage, Base aan Crane Cag Safe ... ‘ , , Diving Tower Maintains Clean Record Essays, Safety First, Prizes for Lawn Mower, Safety Device for Railroad Crossing Barrier, Flexible Railroad Crossing Sign, Wrecked Auto is Valves, a Torch, Should be Exam- Serr ere ee - Window Bars Prevent Accidents Safety Isles,” Unsafetyv of Safety Razor PBlades, Handles for Safety Razor Disk Stropper Safety Razor Improved " Safety Sienal, Lathe-Carriage . Safety Switch for Auto Lights Mounted DOOGTTe DIT wcercvcovewstnese Safetv Valve, for Boil CE Nd tind awe enw ele ce 6 * ; ' Safetv Valve for Fire Protection in Burning Syvstems ....... Sail Roat, Live Ballast for Sail Boat, Square Rigged. Sales Story, Cleverest, Umpire Traveling, ‘Makes_ Operator 480, on r Wat Oil- atures of Novel F Prizes for Sales Tax, Labor and The

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32 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Sales Tax, “Simplicity Tax Penny” for..... Salt and Pepper Shaker Combination Ex- i ee aaa scent ea Warek are knew ae Salt Shaft, World’s Largmest........-.s2ccoss Salvaging Methods of Pueblo Flood........ Sampan, Japanese Waterlogged, Crew Res- Sis oye 5 sade msl wale lagen wie hd, oe SEE, TOT oc 0c sc wevevecesvenes Sandals for Beach Wear ...........-. Sandblast Machine, How to Make a Sandblast Spark Plug ae re eer ee Sanitarium, Open-Air, Accommodates 300 ND re iN is a lenelatadia Ahem e nar Ome yee Sap, Lacquer, Procured from Trees........- Savings Certificates, U. S., Contest for Sell- EEE Eee ee ey ere Pree re Saw oe Knife Combined ..... Saw, Band, Compact, Built Mechanic ally Per- Saw Breakage, Cold, Preventing....... see Saw, Cold, Moves Vertically While Cutting OT Eee ee ere yarn cf rare i ete Saw, Crosscut, Operated by One Man Seated Saw Driven by Automobile ............... Saw Filer, Rotary Gin, Operates Automat- RR rere re ere eee Saw Frame, Hack, for Shallow Cuts..... uP Saw Frame Made from Old Engine Base... Saw Guide for Lumbermen Saves Labor. Saw, Handy Band, for Logging Sawdust as Kindling Sawing Machine, Radial Gate, Cuts Pieces OE ES errr rer rir et oe! ee. ee ee Sawmill Log-Carriage Ways, Cleaning..... Sawmill Logs Stored in Small Pond by New NN Sk cc cine Soa, 5 inka We ae a ie re Be snow Sawmill, Maine, is Electrically Driven Scaffold Made from Ladder Set ESO OME TUCK BF ONG. 6c cccsicsccccses eee Scale, Automatic Coal, Checks Fuel Con- I Sle aiken aw ae Cale wee Rae eas 6 eee we Beare, Computing, for Candy. .......secsess Seale, Egg, Grades Eggs into Three Classes. . Seale Insects, Imported, Become Pest...... Seale, Letter, is Springless and Accurate... eS”: eer eae eee Seales, Herring, Luster Pearls Made from.. nee, “EPMO TOP WOMENS 26a e ccc wcicccvne mearpet, Sanitary Gur@eon’s ......scscecsses Searifer and Road Planer for Leveling NE Seen ot a a ss alk aa make Scenario Contest, Prizes Offered in......... Scenes, Stage, Changed by Colored Lights.. Scholarship, Pulitzer, and Prizes Awarded EE Sida hd ld by ibig'y aaa A Uk Rk A aS School, Automobile, Trains Ex-Service Men School Children Offered Prizes for Safety oo 8). eee ee ee School—College, for What is The, by H. H. MAN ee ae ee ara School—College Laboratory Has Elevator OE ESE See aa ee ee ee arn School Combines Gymnasium and Auditorium School—Desk, Study, Compact and Conveni- MN tin ol hs Gish np Wr arin sa “ow wien dedi i So Baio ole Al ree School, First Government, in England School—Franklin Institute mas, Medals, and Money Awards Diplo- School, Homestead, Pa., Increased Enroll- I al ar ia el a ae xe gS aS as awe ns School, Manual Training, Makes Toys for SRE a EERE Re a ares | ae eee School, Public, Twelve-Room One-Story.... School Pupils, Country, Build Concrete Le ee ere ee eee School Slogan, Navy, Makes Good School—Smithsonian Institute to National Gallery of Art........... School—University Students Build City NS I oo ordre wile KS eae ew Gis awa Scientific Research, Latest Developments in, by C. A. Briggs..... 122, 282, 442, 602, Scissor Sharpening on Bottle............... Scissors, Valve-Key Tool Made from Scissors with Fighteen Uses .............. Score Card Holder Clips on Table Scott, A. N.: ing Houses Scout Cruiser So , SEARS eee ee eee ee Scouts, Boy, Build Mohawk Village Scraper, Bearing, Piston Ring ere rrr ere ere? Seraper Blade, Detachable, of Special Steel. Promote ‘for 762, Improved Methods of Fabricat- 23 Scraper, CAM ...ccsccccccccccccssesvces io ee Scraper, COCOMNUt ...ccccsccsccccsccssccses 272 914 Scraper for Truing Center Holes.......... 461 823 Scraper Hitch, One-Man ........-.eee-seeee 726 505 Scraper, Insulation, Efficient .............. 133 Scraper, Manure, trom Plainer Bit......... 636 824 Scraper, Pan, Nickel Plated ..........-.... 914 * Seraper, Patternmaker’s Roughing ........ 928 ¢ Scraper, Worn Out Ruling Pen as.......... 791 126 Scratches, Removing Negative ............. 786 933 Screen and Wooden Doors Interchangeable a Parr rrr rT re ei ee ree ee 85 353 Screen Counter Panels Prevent Drafts..... 617 266 Screen Door Hook Aids Automobile Ventila- ere cee eee Te rr ere ee errr eee 297 639 Screen Door Made into Storm Door........ 958 $32 Screen, Photographer's Retouching, Save TS SO eee Gee Rama Re eae nee 912 164 Sereen, Smoke, WEAKING BO cccccsccrcscgccsss 612 454 Screen, Stone Crushing Plant. Erection of.. 390 Screening Gravel by Gravity............... 587 264 Screens Kept from Rusting with Asphaltum 72 WEE, Gawenka Choad ace see ake eos pee ns 307 626 Screens, Traveling, Cleanse Water for Steam ar re Sen ar Pee 343 69 Screens, Window, Hook for Lifting......... 316 454 Screens, Wire, Metal Letters for............ 314 477 Screens, Wire, Protect Park Rules ........ 428 4 Screw and Bolt Holder for Tight Places.... 939 123 Screw Cuts Own Thread in Metal........... 718 632 Serew Propellers, Shrouded ............... 77 Screw, Wood, Cannot Be Turned or Pulled 430 Se Scene aaa ee eR Oe OE CES ke Gee 913 938 Screwdriver, Flexible Shaft for ............ 426 774 Screwdriver. Heavy Service ...............-. 449 Screws, Lag, for Concrete Floor............ 296 9523 Screws, Magnet Holds ete AiG ea rai fen ee 935 249 ee TEE conc ta duns se veSedeaawte 614 566 Bervewere Permits, TEAPGOMIM 2 ccccsicccssesss 289 267 Sculptors, U. S., Compete = Montevideo PINE © os iyss. ae ee wala We eee wees 159 590 Sculpture, Permanent, Great "Persons Com- 208 OL ae ere ee 840 331 Sculpture—Statue Cut in Rock Found at 572 Cree Bae, GOGO oie css see cssccvsces R87 89 Scutcher, Mechanical Flax ..............+- 708 786 Sea Level, Change in, by C. A. Briggs...... 122 64 Sea, Miniature, Naval Gun-Fire “Spotters” 261 PT Ci chicceteh Chistes etbesswehes cee cce 402 274 Sea Shells, House Made of ...........e.e00- 409 Sea Swing at Wilson Beach, Chicago....... 340 59 Sea Tide, Concrete Shore Line Holds Back. 19 799 Sealing Machine for Miniature Tipless Lamps 532 851 Sealing Wax Protects Wireless Switches. 158 Seaplane Aids Naval Inspection............. 3 959 Seaplane, Anchored, Outrides Forty-Mile-an- 958 Se SON cc ccac eb asses Cars hae whawnenes 264 Seaplane Engine, Multiple Drive ........... 670 480 Seaplane for Land OF Wate?....cccscvssces 804 Seaplane Housing, New-Type Shed for..... 333 508 Seaplane, Mono, Makes Fast Trip with Pas- Pree Ce ee rere Ce ee ree 854 342 Seaplane—"NC-4" Crew Awarded Portuguese 714 DIOQOTRRAOR ooo oc heres cert ssseesssevevicns 812 Seaplanes, Naval Air-Service Ship for...... 646 242 Seaplanes, New British, Have Wide Cruising 104 LESTE TUE ESS RTT Eee eT ree 587 Seaplanes Survey Venezuelan Oil Fields.... 224 319 Seaplanes Used for Social Purposes........ 519 Searchlight, World's Largest Powerful..... 655 873 Searchlights, Actinic-Ray, for Motion Pic- i ers eee eee ee eae ee ee ee ee 200 991 Searchlights Controlled at a Distance...... 74 121 Searchlights, High Power, Aid Fire Fighters 536 Searchlights Illuminate Dance Hall......... 416 567 Seasoning Methods, Wood, to Be Studied.... 754 53 Seat me Backrest, Adjustable Lawn....... 642 Seat, Garden, Made of Sea Shells... 409 319 Seat, eee Oil Well Puller Truck Has 253 Bent Pass, Creanere AWS once ccvcios sev’ 265 789 ree ea ee ee 630 Seat Unit for Trucks, Detachable.......... 467 922 Seats, Concrete, for Visitors of Southwest 473 Ce RD ceacGnas sc creed sewrwteosteawns 429 925 Seats, Motion Picture, Elevated with Pennies 362 336 Secrets, War. Good Subjects for Peace Pub- 861 RE PE ae ee errr ee 43 Sedan, Electric. for Invalids and Shoppers... 421 102 Seed, Rubber, Utilized for Oil............... 490 Seed Testing and Germinating Device...... 460 3 Segmental Pilates, Turning’ ......-..cccceee 289 600 Semaphore, Human, Traffic Officer is....... 42 445 Sense, Getting Automobile, by H. H. Wind- 126 eS ER ree Pe ere ee error er, 348 118 Serum Produced bv Pasteur Institute 73

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POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 supe and Drugs, Commercial Production OL ceocvecceesece Service Cock Wrench Service, Greatest City, ‘ OE SO. iacaeded ceeegin Masen veer ewan ed Service Station Oil Containers Sewer, Closed peverpene Creek in Buffalo Be SED a vc eae cee Kes bade oy teehee Sewer, Gigantic, Collapsible Steel Forms for Sewer Inspection Lamp Sewer Pipes, ipeerctepeer Degree of Bend COP s6:406 ek 6545506 4RS Wee teues és 000s a es Sewing Machine and “Writing Desk Com- DEE ccxcdeeh’cosObbededdeesanaceveankeues Sewing Machine Does Family Darning..... Beweeet DEBS SHO cn ccssccieuasetesas Sewing Machine Motor, Attaching ......... Sewing Sets, Helmets Made into.......... Shack, Portable, for Ice Fishing Shade 3racket Accommodates Ra en Pee PT TT rer nt Cree Shade Fixture, Window, TOW BME TOGO sccccvccecccvevccassscee Shade Flapping, Window, Preventing...... Shade, Window, Saving Device Shades Attached to Rollers .............s+- Shades, Umbrellalike, for Auto Tires....... Shaft Bearings, Inexpensive ......cccccscce BUATt, EARS, WROR BO Bee. ccc cccvecseuenex Shaft Log of eretmajenapnin Reducing Noise and Friction om ....... Shaft Speed Indicator arate sat soccer nh os tt Shaker, Combination Salt and Pepper, Ex- CEUGSS TORRONE cc cker css oevesicnvaxeses Shakers, Salt and Pepper, Made of Paper... Shaper Attachment Cuts Irregular Curved Perr erre rr rr rire er erre eT Teer Shaper Cuts Gear Teeth in Multiple....... Shaper Toolholder, Three-in-One Shaper Used as Surface Grinder Shaper Used to Make Core Suarpemer, TAG CUPPSE occ cc wccccccccessss Sharpener, Knife and Shear, Works Rapidly Tm ERE Se ee ar, eee Sharpener, Motor-Driven Pencil Sharpener, Razor Blade, Has arr ry eee eT ee OTE ree Sharpener, Simple Pencil ..........cceseee Sharpening and Thinning Machine for Twist DE. «a4 view bean KARO Se Owe See =e Sharpening Attachment for Lawn Mowers.. Sharpening Machine for Household Cutlery. Shaving Brush, Sanitary ........-..eseeceees Shaving Tube Squeezer Saves Cream....... Shear Sharpener Works Rapidly by Hand... Sheath, Lead Alloy, a Shed, New-Type, for Housing Giant Sea- CT SCPE ETT ETT CU VETERE CL ee Eee Sheep, Australian, Protected from Wild Dogs Sheep Dipping Process, Model Shows....... Sheep Shelters, Tentlike, Protect Lambs from Weather Sheep, Trained, Does Stunts .....cssccsecee Sheet Metel. Beading Tool for............. Sheeting,- Plate-Steel, Pulled into Place by RE on atacwaacciee av ObCb KCK SEW O Ca wR Shelf, Simple Displav ........... Shell, Marine Gun, Fires without Flash. Shell, Portable Band, Moved on Truck Sheller, Antiquated Corn Shells, Sea, House Made of............. Shelter—Vines Trained Umbrella- Shaped. Shelters, Dressing, for Red River, North nc Janes d ena et bees babes sees as ee Shelters, Tentlike, Protect Lambs from TOES Lice eee wes oss ARO Na te cae SKE Wee % ee ee ON icing} G:birs Wake hie Wimie we o'6 Ke Shield, Folding, for Camp Fire... Shield, Portable Lamp, Made of eee Te ee Tee rT TROT TLE Ce Shifter, Box, for Docks and Warehouses... Shingles, Tapered AGWROIE « «onss i cwccswcces Shining Machine, Electrical Shoe........... Ship Accorded Unusual Honors, by Frank B. Howe Ship—Battleship “Washington” Launched Ship Aluminum Soon to Be Berths on Pivots Prevent Seasickness. Ship “Campania,” Blowing Up ............. Ship Channel Opened by “Underwater Plow,” by P. F. SpitsfaGen 2... ccwscccvessceseses Ship, Crushed Bow. Makes Distant Port.... Ship—Destroyer “Wickes” Won First Hon- ors for Efficiency of Operation and “Zellin” Second for Water-Tight Wiring 5% 33 Ship Dock Fires, Adjustable Platform for ‘bot cchknm 6 ae bdo ween eek ea 6% ; Ship, French, for Land or Water........... 181 Ship Frozen in Ice Forms Drydock........ 535 Ship “Golden State” Breaks Record........ b98 Ship Hulls, Copper-Covered, not Impervious i Sen cine tenu ee baeww es whe hous 6 oe ees 244 Ship “Israel—98," Mine Laying ............ 810 Ship Loading Conveyor, Flexible ........... 901 Ship “Milwaukee,” U.S., Launched Bow First 63 Ship, Model of Full Rigged, waagas Half PE ich aS wie ee BNW de wens 6.68 0 : 905 Ship, Naval Air-Service, for Handling Blimps and Seaplanes .......... vee a ee Ship, Ocean-Going, Print Shop on. ‘ . 559 Ship, Oil, Bunkers Four Ships at Sea Sim- I et ae wag can win ea oad bien waka. 516 Ship, Old, Found Under Big City........... 93 Ship Operated On for “Iron Sickness,” by to SON” Gikbénanaweadnesseeuca : 696 Ship—Packet Comes Back, The, by H. H. 0 Ea ES Se eee 385 Ship Propeller Blades, Grinder with Flexi- OR SO ee ee ner 416 Ship Propellers, Improved Method of Cast- eT ree er ee Cer eee Ter Tere 40 Ship Propellers, Shrouded Screw 177 Ship “Quest,” Antarctic, Equipped for Hara- ee ee I ok aee cae sw ek aa as ens 818 Ship “Quest” for Antarctic Expedition...... 641 Ship Rats, Hawser Trap Catches and Cages 383 Ship Scene, Realistic, on Stage, by Harry A. PE ahhbn tat astsicch xe eakidetsesay 43 Ship Shop Carries Full Line of Merchandise 688 Ship, Square Rigged, Novel Features of... 591 Ship — Superdreadnaught “Washington” DE niet eu wel Ores ab aawab a thea ae 720 Ship, Tank, World’s Largest, Oil Industry A BSR ee aa 648 Ship “Tokyo Maru” Destroyed by Burning ND Mie WOON. on.6s5sa cok nas <desccs ane 25 Ship Wreckage, Submarine Lifting Magnet IT a iota lik ik ra ie aE ead 711 Shipbuilding, Emergency Fleet, Ends...... 846 Shipping Board Opens Office in St. Louis, ‘Mo. 640 Shipping Posts for Northern Siberia.... 557 Shipping, Proper, Stimulated by “Perfect Package RE nse 919 Shipping, Reinforced Collapsible Bag for. 35 Ships, Automatic Dock Fenders Protects. 111 Ships, Foz Code Signal System for........ 596 Ships, Fruit. Forced Air Ventilation for. 332 Ship’s Fuel Cost Less Than Nothing......... 22 Ships, Fuel Oil, Increase of............. 744 Ship’s Oil Tanks Cleaned with Air.... 114 Ships, Oil-Burning, Safety Valve for Fire hope a rrr ee , 402 Ship’s Portable Milling Machine ” : 376 Ships Stabilized with Giant Gyroscopes, by Dy BE. cen cdaaeeade ts we eee én 552 Ships, Wooden, Pontoon Bridge Built of 513 Shocker Model. Grain. Works Successfully. 412 Shoe—Brogue Made of Imitation Leather 233 Shoe Shining Machine, Flectrical ........ 374 Shoe Soles, Sheet Steel Guards for... 432 Shoe, Steel Ridged Arch Support Built in.. 75 Shoe Store Has Shoe Sole Shaped Entrance. 574 Shoe Store, Traveling Automobile ...... 164 Shoe Supports, Steel, Add Comfort to Lad- el Sr ee vibe awk ae van bee Ale « Shoe Trees with Studs Stre te h Shoes W her re EE Wl oe ie es a Ae A kw an 914 Shoes, Antiskid, for Slippery W alks 107 Shoes, Feathered, is Latest Parisian Stvle 187 Shoes—Sandals for Beach Wear 593 Shoppers, Flectric Sedan for.. $21 Shopping Bag, Paper bg ‘ : . 592 Shops, Disappearing, Proposed for Theater PL ais Maa hawe © cam , 86S Shore Line, Concrete, Sea Tide Held Back by 19 Shot Tower, Old, to Be Preserved. . ; 269 Shoulder Gauge, Internal ... . 617 Shovel, Steam, Works in Far Northern Spitz SR yee ee ‘ Shower Bath in Trunk for Travelers , 168 “Shower Street” Displaces Bathing Beaches 81 Shows. Punch and Judy, Delight Englis} Ce Sued ccareoasene at 60 Shrine to Buffalo Bill on Lookout Mount: iin by FE. C. MacMechen iin sla Shrinking Iron or Steel Rings 130 Shutter Control at Rear of Camera 615 Shutters, Window, as Dining Room Paneling 785 Sickle Guard Cleaner . Av mnt ome s 3 Sickle Sections, Mowing Machine, Removing 1

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34 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 + me o ards Dump Wagon, Lever System Lifts jecar, Bicycle, for Carrying Bundles...... idecar, meaner er, eaenoned Built Valise Fits 11 Sidew alk He se fornia — Sieve, Oni Set, Power Driven....cccccoces Sight Ab tit Yy, entee. TORU. nec deeceecevess S we 2 ight. Rifle Range-Finder, Used with Both E i‘) Sigh ‘ar, King’s Auto Becomes..... Sign Electric, Has Few eee Sign, Electric Landing, Marking Aerodrome Pe Geereoe, DMPO cx ceercwcvscvasnevas ee, WE, CUBE ABECPASES nacceccecccscsccsas Sign for Business and Pleasure Car......... Sign, Larae Bank, Contractors Names on... Sign Light-Post for Chinatown, San Fran- ROHS O HO She AROSE SCHE CEASE RHDAET CER ODORS Sign Post, Moto rists’, and Directory Com- OT! BESS err ee ye ore eee oe eee Sign, Railroad-¢ re ssing, Wrecked Auto is.. Sign, Tratiic, is “Silent Policeman”......... Signal, Aut is Parking Light and Mirror... IN CORN, UPON og hrs os arg aia bal ce Wt, We Signal, Aut Uses Incandescent Neon Gas... Signal t. Night Watchman’s.......... Sig ger, aoa ae See Sig d r, Horse Fountain if... “~— licated, Railroad, for Foggy Sign fety, for Lathe-Carriage.......... Sign ke-Bomb Falls Very Slowly..... Sign yvstem, Fog Code, for Ships........ Pe, TCIOSCODINGE AUIS ..crcrcsowcsennear Signal, Traffic. Anti-Knockdown ........... Signaling Device for Oil Wells............. Signals, Atlantic, Portable West Coast Wire- PA eee ra en near Ss Signals, Crossing HM iman Semaphores as... ignals, Secret, of Germans, by C. A. Briggs enboard Pictures Suggest Civic Improve- : “Keep Off,”” on Cocoanut Trees...... Signs, New Road, Courtesies Fostered by... Signs, “Park All Day,” tor Autos in Safety Ga atcha eo Wik vc dre eh ace oe eae kids ob ath ee Be rrr rn een Silent Tribute, A, by H. H. Windsor........ Silk and Swamp Grass, Hat Made of Silo Anchoring Against Barn eee REE Witt, GOOts 2. os. ccccccccovsca Silver Mine, “Silver Islet.” to Be Reopened.. Silverplating Method, New Electric SUG COP DISNDGR 6. ccc cccccccceconwce Size Changed by Motion, by C. A. Briggs... Ski Stabilizers on Ice-Racing Motorecyele... Skidding Logs to Mill without Flumes or MME wiais © p'6'S.d Ga okt. wine a ok Hans a ewe Skinning Device, Automatic, for Hides..... Skull, Lion's, Bone Structure of, by C. A. EI CR ris havin da in) anes Ged A'® oa ae be Oe Skylight Ventilators Opened by Gravity. Slate Waste as Asphalt Filler.............. Slaughtering Gun Kills Humanely Sled Brake Makes Coasting Safe Sled, Electric Lighting Plant for........... Sledge Trip, Wonderful Endurance, with Dogs Made by Jap Sleeve, Sheet Metal, I ede ila aia te bin Ahi Wa. 6 a-iae a nn @ Ale we oe hw Sleigh, Automobile, for Use in Canada Sleigh Runners, Auto, Making.............. Slide, Toboggan, Made of Waste Lumber.... Sliderule, No Balloon Trip Complete without, by C. A. Briggs Sliderule, Triple-Disk, for Gear Calculations 2 Slides, Machine-Tool, for Home Shop Sling Aids Unloading Hay Slogan, Navy. Makes Good ee SPOON, GEEEEONNE we iascisaccdncuceder Slotting Tool Holder, Adjustable........... Smithsonian Institution to Promote National Gallery OF Ast... .ccccees Smoke Screen, Making a Smoke Screen, White, Replaces Black Smoke Shortens Life of Metals Smokehouse for Curing Pork .............. Smokestack Ladders, Guard for ............ Smokestack, Lofty, Shattered with Gelignite Smokestack Sparks Arrested without Ob- i Se: . wok SAG ee EOS 40 bind 0.0.8 ees “Smoking Mountain,” “Airplane ‘Photograph OL cecccccerscesetseeresesesessrrsesseses 114 S438 aoa CIS 1 F mle Wea mle bo DD IO RO crn > to oo “12> a 685 Smoking Sets, Helmets Made into.......... Snagging Deadheads in a Lake, by A. B. ee Tere Tee ee eee Tr ee Snake Millime G& WUGiMeGS oo cckcsccccseseves Snow Blasting on Road Over Mount Rainier 3 Snow Handicaps Transandean Railroad Snow Lighthouse, Building a ............. Snow, Melting, Resembles Volcanic Erup- SOE co cbebcdkackhaces spend sas Gactedseueesendce d Snow, Mountain, Used for Irrigation........ Snow, Steam Shovel Clears Snoqualmie Pass of, by Lawrence William Pedrose......... Snowflakes Photographed by Farmer Scien- Re et ae errr rT Te Terr er TT ee Snowplow Pushed by Tractor...........e.0.- Snowshoes, Rawhide for Repairing......... Snubber, Log-Train, by Lawrence William Pedrose 2 ae Sa hc ac ig eS ey we aN ks a Soap Made from Mineral Deposit ee ere res. Sockets, Multiple, for Electric Utensils..... Socks, Children’s, Made from Worn Stockings Soda, Baking, Whips Stubborn Fire Soda Fountain Press Makes Orange Drinks | S| RAPT PP er rrrrecrrecrririrr rT TTT en ot as weed wkd ew gk eee Solder, Wiping and Babbitt, Heating MOseereme Bt, BAGSORIRRIS ..cccccccsccesece Soldering, Electric Heater for Pera rer errr err cr cee ee Soldering Iron Heated in Coal Fire........ Soldering Outfit, Low Tension Electric Soldering, Quick Method of ........cesssecce Soldiers, Blind, French Sample Train Aids.. Soldiers, Ex-Service, Trained in Automobile PE dis kiials kha Raa ee cama bow eo ae So Sound Amplifier Augments Religious Service Sound Amplifier, Electric, Uses Rigid Paper PE nc abesusc enna eeuees Spacer Ring for Roller Bearings........... ene Collar, Adjustable, for Milling Cut- te Senden Tractor Plows, Harrows, and Culti- vates Spanner Wrench, Making an Adjustable 773, § Spark Plug Attachment Intensifies Spark.. Spark Plug Cleaner, Sandblast ............. Spark Plug, Huge, Forms Auto Body Spark Plug. New, Has Circular Flame...... Spark Plug, New, Has Visible Intensifier Gap Spark Plug Tester, Burned-Out Lamp as.. Spark Plugs Cleaned and Protected by Metal CIEE cincedsbateusen sewer eeasiven t's Spark Plugs, Faulty, Gi aos wie Neth eat Vou ce kawecna ns BPRS, BOT y, CRRGMIRE occ cess csdeenciess Sparks, Smokestack, Arrested without Ob- Se) SEE ea waeks vce ea Wes o> sea at Sparrows, Nest-Box Trap for Spectacles, Opera-Glass .......... Spectroscopic Test for Purity of Gold a See Speed Controller for Autos. ........cccecces Speed Indicator for Motor Beeed Tmdscstor For GMOLE oc. ccc ccc scncss Speed Instrument, Cutting, for Machine Tools Speed Record Established in French Air- SIN SUS rng ie ee en we dig ena Mos wie & a Speedometer, Anti-Tuberculosis Seal ....... — High Rotating, Equilibrium Device ts at aie Nn a We ae ae a as En Wn ala oe & ain Spitzfaden, P. F.: “Underwater Plow” Opens Shipping 1 eS ie eae ee om Sponge Nozzle for Washing Automobile esas ee ee eS rearrrrerer e Spools, Film, Candlesticks Made from ..... Spools, Film, Ticket Holders Made from.... Spoon, Knife, and Fork Combination Spoon, Nonsliding Cooking ................ spaement. Auto, Worked from Inside Closed Spotlight, Bellow-Front. for Closed Cars .. Spotlight, Bouquet, Illuminates Singers’ Face Spots, Sun, Affected by The Earth, by C. A. ED) coe a da Wes o-00 5.86 ee “Spotters,” Naval G ee errr. fer errr eee Sprayer, Improved Cotton, Speeds Work.... Sprayer, Plant, Sprays under The Leaves... OY Te . Seer ee er ere er Syringe Holds Radiator Hood Open......... Spring Leaf Aids Removing Earth Around EE Cetera dicta doi wieuiale nea aa e ea ech & A Sade Spring, Spiral, Removes Carbon re, AO, RAO ROTUM on ois c icc cscers Springs, Watch, Broken in Thunderstorms, by C. A. Briggs ee rTnrTnrTnh MhDinnN bin tin

Page 35

we eS eS ee

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Sprinkle Device Displaces Bathing Beach... Sprinkler, Motor-Driven, Waters Wide Areas Sprinkler, Whirling-Head Lawn, is — PUGDGRMEEE covoscesccecesnsseccessessees ° Square, Surface Gauge Attachment. SOP. cene Square, Try, Centering Attachment Squeegee, Auto Windshield, pe Bree eee Squeegee for Small Windows eTUTTT TT ee Squeezer, Shaving Tube, Saves Cream...... Squirrel, Bird, and Bulldog are Fast Friends Stabilizer, Giant Gyroscope, for Ocean Lin- ore, By Goeorme FW. POG. ccccctscessctvcase Stabilizers, Ski, for Ice- -Racing Motorcycle. Stadium, Pasadena, to Be One of World's Largest, by John Amson Ford............ Stadium Planned for Illinois University.... Stage Scenes Changed by Colored Lights. StaRe, MOVSIVIRE TOC cc ccsccccrevecesse Stake Sharpening with Hatchet............ ——. Knockdown, Mules Travel to Hawaii DR cacnsndses CER e eee eT Aas cde aeeescennee Stamp Cancelling Machine for Letters..... Stamp Case Used for Lack of Small Coins.. Stamp Moistener, Fountain Pen ............ Stamping Machine Seals and Counts En- WEGE ches rctanessisscntecns dbdawei dae ss Stamps, Rubber, Inking Pad for Se, MUGEN WE Sesacccrtccavevdanee Stand and Seat Combination Houses Tele- MEE <stdded Mon behb ee eens tecen can eeeeese Stand, Carom Board, Revolving ............ Stand, Flatiron, Fits in End of Ironing PS 6s de dcccdeewstdesbeeevacdacdéenuse Dee TO TeSCGEES BVOM wc cccccscccsicssccs Stand for Washing Car Parts.............. — Roadside Business, Erected at Small | SPePeeRePPULELELTEEPELELLILrrreriirie Mind, Gert Bersese PVG 6c osciccscccavcssess Staples, Chain Repair Links Made from..... Stars Appear as Points of Light in The Larg- est Telescopes, by C. A. Briggs Starter, Power, for Farm Tractor........... Station, Chicago Union, Train-Shed Model for Station, Signal, for Capturing Escaping GEE nga cceka sieeve eee gasneneueene Stationary Centers, Finishing Work Between Stationery Embosser, How to Make a Stations Announced by Electric Roll Statue, Bronze, of Simon Bolivar........... Statue Cut in Rock Found at Crater Lake, CE socccdensgs oe baneeeres Kaeo nouwenes Statue, Equestrian, of General Rar ee rer eee Statue, Indian, Commemorates First Settle- ment of Plymouth by Mayfield Colony.... Statue, Lewis and Clark, Presented to Uni- versity of Virginia Statue Representing Se” ac bado vanes Cadena e eS Reena Skee Statue, “Wild Bill,” Wire Cage Protects.... Statues, Elephant, are Business Man's Hobby Steady Rest for Lathe is Self-Centering..... Steady Rest, Roller, for Milling Machine... —<o and Gas-Engine Road Kollers Stage BO ee OO Ee Oe CELE TOT ET ETE EE ee SR Oe) ee Steam Boiler Built Like Percolator Steam Boiler, Vacuum Wrecks Steam Engine, Toy Electric ............0.8. —— Excavator, Endless Tread, Fords vive Electrically Steam Motor Truck as Switch Engine ee a err Steam Shovel, Snoqualmie Pass Cleared of Snow with, by Lawrence William Pedrose. Steam Shovel Works in Far Northern Spitz- Pr ee re er ee eee Steamer Berths on Pivots Prevent Seasick- DE -vcctawen ines Rake een eee khdenekeea Steamer “Golden State” Breaks Record..... Steamer, Oil-Burning, for U.S. Cable Service Steel—Alloving Metals, New Discovery on DE DE ks eb CAG ORO ie EO Ra wee vataeneaee Steel Broaching, Soft Stringy ee I Bc ce Ub Karke ee aaa oe bie ae Steel, Hard, Cold Saw Moves Vertically Co a! Perro TT ttre Steel, Hardened, Cut by Soft Iron Disk Steel Holes Made Best with Punch......... Steel, Largest Crucible Furnace for Manu- eer rT reer rete ee Te eee Steel Made in Five Hours by Frenchman.... Steel Newspaper Stand ....ccccesccscccrvers Steel Plate Storage Yard, Convenient 281 528 434 618 605 eis De, Bene oe. ci etsbneenevanece Steel, Soft, is as Stiff as Tempered Steel, by Cc. A. Briggs Steel, Stainlees, SE cinttseheetetedabeke ee Steel, Structure of, Compared with Iron.... Steel Tubing, Electric, Made by New Process Steering Wheel, Auto Control Instruments on Steering Wheel, Auto Gear Shift is on Steering Wheel for Armless Autoist Steering Wheel Handle, Automobile eeeeee eee ween 4 Stepladder, Table, and Ironing Board in One Stereopticon Feature of Theater Curtain, by ds ID cnceasetedvescswoteedde Stereopticon, Simplified, Portable .......... Sterilizing and Sealing, Egg, by Machine. Stethoscope for Detecting Faulty Bearings. Stethoscope Instrument Detects Liars...... Stick Sharpening with Hatchet............ Still, Cleverly Concealed, Fails to Fool U. §. ear ree ere re Pee PP Stilts, Spinning, German Boys Have Stocking Sales, Window Display for Stockings, Children’s Worn, Made into Socks : Stockshow Pavillion Proves Profitable...... Stone Crushing Plant Screen, Erection of. Stone—Granite Block, Record Size. Stone—Letters Chiseled from Rock by Ww ate rc Stone Mulch for Prat Trees. 2c cccscvccvese Sone —wanene. ae in Rock Found at Crater BA, GHEE nn. bikes ceed b05bs bende Ende es 6 Stone Table ‘J Marks Trail of Fur Trader. Stone—Veranda, Large, Made of Stre am EE ahaweiiek eee) ies Cee RR eeeeered Pe Cres es Oe... sp saene rene ahewe Stones, Gem, Colored with Radium ee, Bee. Se EAE: sccccncvaceranevoesess Stoppage, Machine, Recorded Automatically —e Batteries on Mine Locomotive Test- OOH cece eseesceceesteeeseseeseseeseesesesses Storage Batteries, Sealing Cracks in........ Storage Battery Plate Separators, Tool In- PRE, cok cde OH esitherea dd ren ehacdtedveneens Storage Battery Terminals, Corroded, Ke- SRO Ceee Sone BIG isascessvesciecsesere Storage Battery Terminals, Repairing Loose Storage Battery, Thin Plate, Electrieal Out- DE OE nc setsns cheb asc aren eased ecnuvsose Storage, Cold, Hot Rooms May Become..... Storage System, Pneumatic, and Filling Sta- CEO EO GERONIMO ccccvcscvesvecnes Storage Yard, Convenient Steel Plate Store Awnings, Protecting .......-cccsecee Store Buildings, Rounded Corner, Have Ad- vertising Advantages Store, Disappearing, Proposed for Theater PI Lubecdandee kekene ns Dane aeeede eh se ee Store on Ship Carries Full Line of Merchan- dise Store, Shoe, Has Shoe Sole Shaped Entrance Store, Shoe, Traveling Automobile Stores, Belt Unrolling Device for Stores, Floating Marine, for Lakes and CRE SE. Coc ak ee bccn ncaeeeweesd sawee Stories, Canadian, Prizes for ......... Stories, Infantry Platoon, Prizes Offe red. Stories, Naval Adventure, Prizes for Stories, Snort, Prises FOF ...cccevesess Storm Door Made from Screen Door Story, Cleverest Sales, Prize for............ Statue Models Destroyed by Fire.......... Stove, Electric, for Travelers.............. Stove, Folding Camp, Burns Hay, Wood or DERE. dict Wioak CP6LD O60 CSN ACOs ede deeb eeowe Stove, Folding, for Camp Fire eee, See Be OO a caste wd eweleSeee ns Stove, Gas, Swinging Burner for Stove—Heater, Small, Made from Flowerpots $5 Stove Hood, Oil, Directs Heat............... Stove—Oven, Electric, for Picnic Park Stove, Parlor, Resembles Phonograph Straightedge Made from Old Razor......... Strainer and Pail for Kitchen Refuse... Strap, Broken, Attaching Buckle to........ Straps, Auto-Anchoring, for Shipping....... Straw, New Plant that Makes Gas from.... Straw, Toy Horse Made of Streams, EE ere ere eae err er eet ee re he Street Car, Freight. Building W recked by. Underground, Located by Strong Hill Street Car Transfer Puncher, Foot Lever... Street Cars, Decorated, Japanese Prince Wel- GOUROE BF csccess Street Car Line Kept from Sliding Down _

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36 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Street Cars, Old, Used in Building House... Street Danger Signal, Grated Mirror is.... Street Sign Light-Post for Chinatown, San PE eo csc deeb bseeeeeeaseven seuss oo Street Sweeper, Multiple-Unit .............. Street to Be Cut Through Heart of Boston.. Street Tracklaying in Freezing Weather Street Traffic Sign is “Silent Policeman” Street Tunnel Protects Pedestrians........ Streets, Low Paved, in Iowa Town Carries Water from Hills to River..............4. Stresses, Structural, Instrument for Record- be Sind Sa (eka k ad GONE SRN wee Se aa ke ee Stretcher Can Be Folded into Size of Golf ESS eee err et eae rar yee Stretcher, Wire, Positive Grip.............. String Adjuster, Violin, Changes Quickly... Stropper, Disk, for Safety Razors.......... Stropper, Razor-Blade, Rapid Electric...... — Stresses, Instrument for Record- rt dicin en lap aa ahi Kaew OE ot RCE Students, University, Build City for Own I te or ial s a ete cee coke Ble as Studio Light Regulated by Triple Current EE alatanaliocdie Aine a -ala cele ia'akth aie are me oh a) eel oe nese. OMNES fon cawewdesscecesaee SOW TOOL ois cckowedieveeceves Stumps, Power Borer Quickly Clears.... Stunt Flier is Original and Daring...... i Stunt Flier Miraculously Escapes Death.... Stunt on Wires by Berlin Acrobats......... Subgrade Instrument Tests Load Carrying ESERIES ESE ere ae Ie rence pa Subgrade Machine, Road, Cuts Mechanically FRENDS REPRESS IO ERR tag RSS i Sei Submarine Boat for Off Beach Frolic... Submarine Insigne Adopted Submarine, S-Type, Submarine Tractor ........ccccecesces Submarine, U. S., Roomy Quarters in Subscriber, Popular Church Organist Embody War Experience Mechanics, 72 ‘Years Subway Wreck, Paris, Signal Failure Causes § Suction Pipe, Keeping Air Out of...... Sugar, Beet, Manufacture of, in E ngland. Sugar Cane is Being Experimentally P lanted om “ime ..... weiiGw eaten es Graiole ce ica Sugar Cane, V accination of, May Make It NS REPS re ene ae Sugar Holder, Sanitary, for Cube Sugar. ; Sugar Liquor, Removing Color from, by Lig- OE ns ce nine Udladda es ceed Hit Sugar Mill Waste Yields Durable Building Material, by Thos. Ewing Dabney........ Sugar Refinery Employs Fresh Water Barge Suitcase, Phonographic, Reproduces Distant hit osha cio as ene Sulphur Print, OS eae Sun Rays as Cooking-He: at Medium. yar ivelad Sun Spots Affected by The Earth, by GC. A. Briggs ‘ Sunbeam as Sight Line Sunday “Reformers” Windsor ...... Sunshade, Spring Tn oll shield Glare ..... j Superdre earenent “WwW ashington’ Support, Fishing-Rod ...... Surface Grinder, Shaper Used as Surfaces, Flat, Checkering Surgeon's Scalpel, Sanitary ... Surgery——-Operation Recorded by Motion Pie- Se IN io ili ws 3k te sO .8 Oe ws6% Gabe Surgical Feat, Grafting External Kars on RSS rrr ree reaet = Survey Computers Examinations by The U. S. Civil Service Commission. . ie xe Survey Marks Destroyed by Tre asure Hunt- ers, by C. A. Briggs. are bees ie So aia Suspenders, Lengthening Attachment for... Suspension Bridge Across Grand Canon.... Swamp Grass and Silk, Hat Made of Sweeper, Multiple-Unit Street Sweeping, Lawn, with Water .. Swimming Exercise for Children........... Swimming Exercise of aniescne War Veter- ae re ee eee eee Swimming Pool, Ferryboat, is ‘Novel Play- UY daa tac tar Oi tal ng ah nar ala ws sah ah ww Swimming Pool, Madison Square Garden. Swimming Tube, MRubher ....ccccsccccccces Swing, Locomotive, for Children Swing, Playground, : ates NE Sag aoe tcd ob Ging FW OE BS.» oa oe Construc tion a 2 ‘Ola Rail Working, by H. H. ‘r, Removes Wind- Launched 559 268 429 401 913 586 269 34 588 119 437 937 356 431 119 S02 S06 825 Swing Ropes Made from Inner Tube........ Swing, Sea, at Wilson Beach, Chicago...... Swiss Cheese, Power Press Aids in Making. Switch, Automatic, Turns Lights On and Off Switch, Compressed-Air eons is Ce BOE oi ssc cane sae baesaseseene see's Switch, Electric, is Fool- Proof. re Oe Switch Identification in The Dark Room.... Switch, Safety, for Auto Lights Mounted on Steering Arm ...... écueeeees bane enwewne ee, EE ee ee ee eee eee ee Switch, Toe Operated Leremnian Foil Bank Switches, Knife, Operating sd i atdlal Se ye oa ata Swivel Runner for Harrow ........---cesee Table, Comerete GOrGe...iccsccsccaseceser Table, Convenient Automobile ............-- Tawse, COMVOREIRES TOD. £66 bs ccewcwscwwceses Table, Estimating, for Concrete Materials. Table, Extension, for Kitchen.............. Table, Ladder, and Ironing Board in One.. Table Made from Spruce Log..........-.--- Table, Test, for Automobile and Electric CO ree rrr err ree 675, Table, Well-Laid Dinner, Auto Canteen is. REOlO WHR POSS TOR icc ccccccccesascces Tablet Machines in Biological Laboratory. Tablet Marks Trail of Fur Trader......... Tablet Renders Camp Water Safe for Drink- ME diepecdks Dun nt de eee sem aee ae abso Tabulating Machine Counting Election Lal- NE PRE cad telat a oan kee eae ee ae nere EO, TOME oiiccccascevevan awe wa I UNO SPO. a a's gan helaln ee «a6 6s 2 ees 0 Gee: BOE, DOOSD. Bi. sé cvcce wcekscavsss Tag Attaching Clip for Parcel Strap Buckle Tags, Identification Key-Ring.............. Talker, Homemade Loud................ a Tambourine on Darkey’s Phonograph...... Tamway, Cable, Across Colorado River. Tank, Air-Compressor Supply, Allows for SD I 52 SG tag be wie nee ee a se 0 Tank, Auto Vacuum, Gasoline Filter for. ; Tank, Eighty Gallon Whiskey, in Auto.... i ee POS ka caGansvuncvsneciecn Tank, French, Travels by Land or Water.. Tank, Galvanized Water, for Kitchen Stove See, ‘GORE, TEGeeee TOW bcc acc ecsesss wien Tank, Gasoline, Floated into Garage Pit Tank, Huge Water, Moved on Track Built ge | EP Hae errr Tt eee eee Tank Lowering, Novel Method of...... Tank, Oil, Self Acting Gauge Records Con- SE. GE nda chs Cea cesteeeen eso etcncsananed Tank Steamer, World’s Largest, Oil Indus- Oy ee Oh oaeaws ase ewan sees way Tank, Sulphuric-Acid, Has Special Con- err ore rr rer re waa Tank Trailer om Obl TIUCKH. «02 cccccces Tank, Water, for Keeping Cream Fresh Tanks, Army, Aid in Wrecking and Salvag- ing After Pueblo’s Flood.........see.-. : Tanks, Fuel Oil, in Aleutian Islands...... Tanks, Gasoline, Destroyed by Lightning Without SUrimimme TOM. cc ccccccccevcsess Tanks, Wooden, Stopping Leaks in......... Tap Cuts on One Side of Teeth Only........ Tape, Adhesive, for Mending Raincoats.... Tape, Adhesive, Used to Attach Shades to Rollers Tape, Ome-Man MGROUTIRE 66 oc ccs cesccsees Tape Moistener Has Primary Wet Roll.... Fame, TSWiGiWE PIGt. oo cc ccccsccsccncesans eS ee eee - Tanie, BAe, BNE BEOCROl. o4 ccaciccvcsacvcnss Tapping, Fiexible BRalt for... ...ccsecescocs TRPOIGS, DAVE Zeke Bis ccccccwesivsrsvene Target, Somersaulting Rabbit.............- Tattoo Decorations, Removing.......... : Tax Penny, Simplicity, for Sales Tax...... TOE, BSR, EMOOP MRE TOs cs ccicevvesccdac Taxi Trip, 4250 Mile Airplane, Made with- Tee re eee Te eee TT eee Tea Container for Tea Pot...............4. Teacart Equipped with Stove.............. Teacher's Safety First Essays, Prizes Of- OS SN re ene eer ee ee Tear Gas, Policeman Harried by........... Teeth, Babies’, Sometimes Slow but Always ee, Wr Se. i. BRS 6 orcs tb edscasecaves Telegraph Cable, Land, Laid by Airman.... ee ee eee ee |

Page 37

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Telegraph Circuit, Greatest Single Unbrok- en, Baseball hampionship Series Re- ported Over ........- sesaussssecsese Telegraph Instrument, Printing ankaateash Telegraph Pole Crossarms May Be Raised or Lowered ..... Telegraph Tower, Wireless, ‘Highest on ‘Pa- cific Coast ........ e preseevece Telegraph, Wireless, Safeguards’ ‘Auto. sme Telephone Burglar Alarm Phones Police.. Telephone Communication 2712 Miles Dis- Camt, WireleGS Tire Carrier is Quick Demounting Tool... Tire Chain Cross Links Clamp to Spokes.. Tire Chain is Quickly and Easily Attached Tire Chains, Care of er ee ee ee ee Tire Gauge Tells Pressure While Inflating : Tire Jack is One Piece Casting........... Tire Lock Incloses Rim Stud.............. Tire Paint, Automobile TD TE, MTG cocicdccnccvaseedtecer Tire, Pneumatic, Inside of Wheel Tire Pump, Roller, for Autos Tire Rim Bead Reformer BESS Tee, GS COMO acc ccccccccasces Tire Rims Repaired on Anvil.............. Tire Section is Holder for Trouble Lamp.. Tire Shades for Automobiles .............. Tire Sizes, Fewer, Cut Manufacturing Costs TO BOTGRSOE, COG sccdcevcccceccesescacs Tire Treads, Worn, Rubber Strip Mends.. Tire Tubes, Swing Ropes Made from...... Tire Valve Utilized for Engine Cleaning.. Tires, Auto, Armchair for Bathers Made of ECO, BOO oven 9 6.606600000 ne sesesnceee Tires, Disk-Wheel, Valve Extension for... Tires, Old, Horseshoe Pads Made from.... Tires, Pneumatic, Sectional Casings Save. . Tires, Pneumatic Truck, Resilient Wheels PERE. siserscantdsedageekenceceaee cease Toaster, Electric, How to Make Tobacco Knife Cli Tevacce-Tin Tackle BOR...ccccccecscseccccs Toboggan Slide Made of Waste Lumber.... Toilet Set, Auto, Installed in Door of Car.. Tongs for Handling Hot Clothes in Boiler. ZOE, WOR TOO ccccsecceesesscvsece Tool Box, Ornamental, for Automobiles... Tool Cutter, Lathe, Wedge Principle for.. Tool, Detachable Scraper Blade TOOL COE FRCPOTMUROMOSD 6 scccccccecescescen Tool, Key Ring Automobile................ Tool Modeling with Chalk................. Toolholder, Adjustable, for Slotter Toolholder for Short Bit Toolholder, Three-in-One Toothbrush, Electrical, Toothbrush. Fountain, is Timesaver Tep, Goowrapmion! Globe ...cvcccccccccsecs Top, Streamlined Automobile, Built Like SE EE o's ae nie dibee a ka a eae ke Torch, Acetylene, Cuts Holes in Veneer Cut- i 9 {eS ASRS ar neti area Torch, Electric, for Industrial Uses........ Torch Valves, Welding, Should Be Examined Tornado Destroys Town Leaving Vault In- tact eee ee ee ee ee ee ee ee ee ee ee es Cr ee ee | Tourtng—-Automedtie SOS SA cacasecnsnccesesseseccsuserece —— Automobile Exhaust Heats Water De lsveceneahate det dead eceds aksnEeane)s bee Tourists, Automobile, Given Welcome PEE Sa ccccesrdcuanesetosessazeces Tourists Collapsible Armchair 598 304

Page 38

38 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Tourists, Exhaust Pipe Cooker for........ Tow Bar, Auto Bumper Convertible into... Towboat Makes Record rs of = BIS DL WISI ccccscvescocceses eee Tower, Concrete, Supports “Large Crane. = Falling ‘Church, Remarkable Photo Pepe reer rer Tr tree Satie Tower, Ola ‘Shot, to Be Preserved......... ‘ Tower, Theater, Strikingly Illuminated..... Tower, Wireless Telegraph, Highest on Pa- Ce COE. cn cata inated ecenes Chek eae oe Towing, Racing Motorcycles Started by. Town—Village, Indian, on Arizona, is One of The Oldest in U. Toys for Poor Made in , aS Training Sr a err eer ee Toys “Made in America” Teach and = BY Harry A, Mount. .cccccccsccesces A Toys: Acrobatic Stunt Toy with Music. Airplane Motors Made from Auto Tubes. Airplane Runs on Rope ...ccccccsccccces Automobile, Miniature ........-+-+e2e-e5- Boat Carries Windmill for Propulsion... Boat with Removable Mechanism........ CEOWR, POrtOrMine 2... rcccccccccesacecese Coaster, Four Seated .......cccccsscces Doll Sings or Talks without Squeezing.. ane, Bee, FOP CRPBPOM...ccccsucccecesen Hngine, Steam, Wlectric ......ccccsccccces Ferryboat Runs on The Floor............ Se CE SUE coc cierccneeenesesseannie's Ce hers sneneeraedecew OO A SS oe ee Se DO DE BPR. onc c cc ctcucccescececs Jointed Toy Forms Birds and Animals... ee Ti, TP OOMMNEOM. ccc ccccvcesvesnoes BC PUMOOPEMIOME Bet... cccicccscccvcces i” Eee ren Phonograph Plays Small Records....... Railroad, Miniature Electric ............ Rocking-Horse-Kiddie Car .... i ES ons a nate a awed baw wale os Telescope Teaches Astronomy .......... a Ca Pe UOe ccs seen sensaeseunes Top, Geographical Globe................. Washing Machine, Electric .............. EOE BONEN BOE. cc ccccccccccccscuese Oe MEE, GONG cincscccvanedecsences Tracing Cloth, Eraser Using on........... Tracing Point’ eee Track Built Under Water Tank to Move It =< * enon Railroad, Stops Cars Grad- a Track Laying in Freezing Weather........ Tractor Attachment for Drawing Crank- I Oe iia hea hi x erin pes wade oe was ae Tractor, Bull Wheel Track Layer.......... Tractor Carries Lumbermen to Camps Tractor, Endless Rubber Tread for........ Tractor, Endless-Tread, New Features of.. Zractor Greatiy Simplified .........ccccce- Tractor Kept Level on Hillside by Adjust- I hi Ss it oc ta sates tartcrm a cadet wha ada a CAE Tractor Locomotive Drags Big Timber Load Tractor, Old, Attracts Attention at Show.. Tractor Operated Railroad Between Chesa- peake Beach and North Beach, Maryland Tractor Plow and Weed Exterminator..... E Tractor Propelled Mower Has Front Gang NE Se Sra ni ia a hla laters tds "a race & A uid tin oh Tractor, Rocky Land Made Useful with... arector, Rolling Lows With ......cecccccce Tractor, Snowplow Pushed by ............ Tractor, Spading, Plows, Harrows, and Cul- NR LI hand chai arara me pwnd Algnk 64 atk a emelate’s Eel, COIR . occa cineébussscteenvnen Tractor Wheel Cleats, ee Ne hae as e's Sa Oe Tractors, Power Starter for Tramc Control, Automatic..........cccccses Traffic Officer a Human Semaphore........ Traffic Regulator, .Clockwork Controls Traffic Sign is “Silent Policeman”......... Traffic Signal, Anti-Knockdown ........... =— Bungalow, Auto, is Official’s Quar- SR: Se is aaa ild aed ee A tem a 6 Wid kw ain Sy we bine ee eee, wee. Ol PMO oc cccccencscccecs Trailer, Twenty Ton Capacity............. Train Defeated by Speedy Motorboat in i CE: ako. walnls gu teh ed oe mew aCe soe

654 351 694 330 400 269 672 232 251

Train, French Sample, Aids Blind Soldiers. 703 Train Shed Design for Canges Union Sta- CR cnebd dhe eee e 417 Train Snubber for Logs, by Lawrence Wil- Higa POGPORO 2.000 cc cccegestsscacese 178 Train Stations Announced “by Electric “Roll 337 = Wrecked by Engine Throwing Cow ee SO Err rte eee soon GED Tre ning, Vacation, at Camp Grant........ 319 Trains, Earliest and Latest Type...... coos Oe Transfer Puncher, Foot-Lever......... escoe San Transformer, Speed-Controlling ........ es Transformer Substation Wrecked ......... 55 Transformers, Oil- eee Placed in Con- crete Vats ..... Cceeweaenctenesce’ Ie Transmitter, Throat Telephone errr rer 395 Trap, Crow, Catches Crows Wholesale.... 36 Trap, Fly, Built by Fifteen Year Old Boy 648 Trap, Fly, Rotating Mirror ..........see0- 434 Trap, Gopher, Kills Instantly.............. 569 Trap, Hawser, Catches and Cages Ship Rats 383 Trap, Mouse, Sheet Metal .............+06. 435 Trap, Nest-Box, for Sparrows...........+.-. 306 SEREOOP GOGMEE aon cccewescesac cececceenses 942 Trapping, Cruelty of, Prizes Offered aannee 629 CE ticchaadaes kes Rake b ee Cae aera eee ° Travel Test, Letters Circle Globe as........ 274 Travelers Shower Bath in Trunk.......... 168 Traveling Case for Small Articles.......... 915 Tray, Auto Ash, Hooks on Upholstery..... 368 Tray, Breakfast, Wicker Secretary......... 432 Tray, Cooling, and Dish Drainer in One... 433 Treads, Worn Tire, Rubber Strip Mends... 396 Treasure Hunters Destroy Survey Marks, by CC. Be BE ccc cceseecsccwcscseeneessess 442 Treasure Hunting in Coronado Islands.... 812 Treasury Building, U. S., New Story Added aa DD 6 wh ex 655 er eHestERSOSTEROCHEBO CHES EO OS Treating Machine for Prunes.............. 358 Tree, Cement Filled Cavity Saves......... 108 Tree, Christmas, Candle Holder Balances on BE Oe nooks 0000 ea nges nents voennenseeces 112 Tree Fiber, “Kapok,” Made into Fabric... 262 Tree, Giant Christmas, in Yosemite National PN 6c bcd ga cee eese deat ge gaebsaencasee a 823 Tree, Giant, Dedicated to Unknown Dead. 654 Tree, Giant Redwood, Moved in Upright Po- tien, BF Geese ©. DAV. ccccccccovcesvve 518 Tes Tee, Week BOE. ccc ccccnncncwcesucs 58 Tree, Pioneer Orange, Nourished by Young 5 cast kaed ae eeW tea he wae Ae a eae * 94 Tree Planting Makes Waste Land Profitable 716 Treo, FOOSE, TDOGINE WEE cccccccnccevcses 33 Ten, Beery CPD gsc cc ccssacscscces 714 Trees, Cocoanut, “Keep Off” Signs on...... 428 Trees, Crossbreeding, Strengthens Species, We Mee B. WOES ccc cccetcvccscscceves 70 Trees, Prat, Biome BEUICN TOF... ccscccseses 301 SPOOR, BeRE TMOG BOP os ccsciscccvccscéaen 952 Trees Produce Lacquer Sap.............+.:. 266 Trees—Redwood Giants, Largest of, Pre- served im Sequoia Park ...cccscccccecees 356 Trench Helmets, Steel, Utilizing........... 955 THORMOIS WAG TWACTCREOE 5 occcsvcasscccesas 142 Triangles, Two, Lettering with............ 300 Tribute, A Silent, by H. H. Windsor....... 510 Trick—Bottle Lifting with a Straw........ 951 OE, SOUOMNOEEEOE ce ckdtccetwesssicsecsoveniss 157 Trick Jumping Automobile........sccceses 54 Trick—Wall, Walking Through a.......... R02 Tricycle Propelled by Parrot...........-+- 120 Trinket, Tiny, Hydroairplane Model is..... 204 Triplane, Diminutive, Flies Nimbly with De GE «bbe dS cssWeca reas ncateaeeee 187 Tripod, Portable, Supports Temporary Elec- Se WEEE Kees aps Ub ea na udieshh ae eae so oe 896 Trophy—Bear on Stump Presented Marine PP arr tee eee ey ee 909 Trophy, Gordon Bennet Airplane, Replaced by Coupe RT e eee 319 Trough, Sectional Hog, Is Easily Cleaned. 116 Trough, Sliding, for Poultry House........ 304 Trouser Press, Wiectric ......cccscccccccecs 338 Trousers Sustained by Inside Pelt Adjust- 7 re eer en eer ee 592 Trout Hatchery Pools Protected by Small Rear rrr re eer ene ee ee 808 Trowel, Gold, Lays Mortar for Bank Corner PD kwh bnccacnsiwscee ee Lekeceebes noes 74 eee, Se ee Oe SOD 6 cccncccccswevesess 267 Truck, Auto, is Church on Wheels......... 874 Truck, Auto, Producer Gas on, Reduces Cost 384 Truck Axles, Three-Point Suspension for... 208 Truck, Baggage, Lawn Mower as........ io oe Truck Chassis, Limousine Built on....... ao Oe

e999 wow AeAA A Ul Ss a a. @. 9.9.94

Page 39

POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Tee. Concrete Mixing, Mixes on Way to ib cet eae bie eee wee eee aed 847 Truck. Crane Boom Has Full Circle Sweep. 271 Truck Dumper, Motor, Runs on Rails...... 256 Truck for Handling Crankshafts .......... 618 Truck for Mine-Rescue Work ............ 740 Truck for Testing Scales .......cc.ceceees 361 Truck for Unloading Small Cars........... 388 Truck Freight Rates, Nebraska Repeals.. 164 Truck, Garbage, for Detroit ........... o* 235 Truck, Hand, Spring-Driven .............+. 279 Truck Has Special Platform for Changing Wheels and Brasses ........scceccceseee 545 Truck, Ice Cream Delivery, Improved...... 408 Truck Lever Arrangement Dumps Road Geavel BGR acccccscccscccccsvestscece 532 Truck Loading Device .........---eeeeeeeee 732 Truck Loads, Overhead Gangplank for i RP Fr re ee eee eee 48 Truck, Oil, Carries Tank on Trailer....... 832 Truck, Oil Well Puller, Has Novel Seat.. 253 Truck, Parcel Post, Carriers’.............- 899 Truck Road Laws Forced Upon Eastern re rere Per eer rere Trees 218 Truck, Roller, for Gas Tanks.............. 926 y . SR 8 Serre. cree 467 Truck, Steam Automobile .............e08- 725 Truck, Steam Motor, as Switch Engine.... 575 Truck Stuck in The Mud, Method of Ex- Kecetsenewetedhnkeseae pecekehhen 927 Truck Tires, Pneumatic, Resilient Wheels ERS ery ee rer 58 Truck, Warehouse Motor, Serves Many Pur- PE cc Wtekhchb eee een a eee As Ae wee bees 787 Truck, Wrecking, for Heavy Duty......... 28 Se, OE FFE an dvancucecesivaoncues 664 Trucks, Gasoline, Dragging Chains Protect 678 Trucks, Industrial, Improved Axle Suspen- Tn Ge. scbedaueeetbbeneneeee kat heaaccme 203 Trucks, Motor, Crossing The Sahara with, 3 eee eee 196 Trucks, Railroad Motor, Steering Wheel S US boa deecccbsne wes seme a 913 Trunk Shower-Bath for Travelers.......... 168 Truss, Reot, Pinced Quickly. .......cccccse 734 Try-Square Centering Attachment ........ 605 Tube, Bridge, and Mole Combined Planned to Cross San Francisco Bay, by Harry H. DE Svtccekhba te RA eede scab ane ae nes du 521 Tube, Rubber, for Swimming.............. 374 Tuberculosis Cee, OMORT ca sccnccsece 265 Tubercuiosis Seal Speedometer ............ 748 ey SE I gon ab ce dsee cecensdes 798 Tubes, Inner, as Swing Ropes............. 794 Tubes, Tire, as Motor for Toy Airplane... 478 Tubing, Electric Steel, Made by New DO, Gickceddnne tases baba dedaaedbaneee 526 Tufa, Voleanic-Ash Rock, Handled Like Lumber, by Horace E. Thomas.......... 833 Tumbler Made from Steel Barrel.......... 292 Tumbling Barrel, Improvised ............. 925 Tunnel Building Methods with Tamed EE LAE Or re ee ee 437 Tunnel Built Above Ground Then Pushed i bike ha bis 0k Oki aoe cb ee a 724 Tunnel Gases, Auto, Create Problem, by ee NE SNS a anal emus 48 ie ee ea bio 393 Tunnel Planned to Cross San Francisco Ae Sf a eee §21 Tunnel Sewer, Gigantic, Collapsible Steel Pe BO: scct cee bh ees ake koe eee eee se 842 Tunnel, Street, Protects Pedestrians........ 34 Tunnel, Thames, Planned for East London 702 Tunnel Tubes, Twin Steel, Under The Elbe oe, ERS ne eee 398 Tunnel, Vehicular, Model for............... 42 Tunnel, Widow Derives Income from....... 544 Tunnel, Wind, for Testing Airplanes...... 898 Turbine Auto Washing Brushes ........... 400 Turbine Development, Gas, Remains Exper- | Rr Sr ry rr errerer Tree 838 Turbine Water, Steam, Cleansed by Trav- ee SE CGoan Wad cee uedae & o bd aad a 6% 3438 Turning Machine, Crankpin, Making a.... 930 Turning Tool, Improved, for Wood........ 611 Turning Tool Resembles Twist Drill....... 437 Turret-LAathe Drill PIGIGGP . .cccccpesssccs 462 = Used to Stimulate Early Coke Buy- om Twins, Thirty Pair of, Mental Efficiency of 120 Twist Drills, Sharpening and Thinning Ma- ee ER ee eh Arr are ee 895 Tying, Bag, by Electric Machine.......... 349 Type Making—Lord’s Prayer on Tiny Slug 381 Typesetting Machine Casts Seven Inch Slug 716 39 Typewriter Attachment Tells End of Page 231 Typewriter Cleaned with Blowtorch........ 306 Typewriter Code, Simple ..............008- 316 Typewriter Cover, Telescoping ............ 376 Typewriter Desk, Folding ................ 56 Typewriter, New Portable, Has Standard PONE hans ncasccestsccencnctvesicocsee 515 Typewriter Spacing Rule .........csceee8. 314 Ukelele, Metal, for Rough Usage...... sacos, 20 Umbrella Identifications, Requisites for DEE nck eces ee Cr eceetetederavasevosere 112 Umbrella Made of Oil Paper.............. 804 Umbrella-Shape, Vines Trained ........... 268 Umpire Cage, Baseball... ..ccccccccsccccece 334 University, London, to Give ener Man- agement Course .....-++eee0 ccoee 406 University Students * Buila City” “for: Own DE (2) tak dasa annus eee a KG oa 789 Unloader, Pneumatic Boat, Eliminates Much DY cxcikdsdaeetees Heeb hones Cen eh sen es 99 Unloader Truck for Small Cars............ 388 Unrolling Device, Belt, for Stores......... 389 SE. GE oc bahamas Cance ee benseeseaseaeuer 273 U. S. Army Armored Airplane.............. 721 U. 8. Civil Service, Engineers, Draftsmen, and Surveyors Wanted in................ 159 U. S. Marine Corps Airplanes Make Record Tour of Cuba and Caribbean Sea........ 111 a Dee DE hee ee cain es ceacatnceeess 58 V-Block, Adjustable Angular............... 780 Wee, BOE CD 0650006006800 00000000 136 pe "EF ere ee 449 Vacation Training at Camp Grant.......... 319 Vaccination of Sugar Cane May Make It DE cose pee bbaeeetee cases a6ne s-« 116 Vaccine Removed from Calf............... 737 Vacuum Cleaner for Close Quarters....... 228 Vacuum Cleaner, Nonelectric .............. 753 Vacuum Cleaner, Window Display, Mechan- Pee ee eee 278 Vacuum Tank, Auto, Gasoline Filter for... 596 Vacuum Wrecks Steam Boiler.............. 197 Vereee GG Gere Deer te ORG. .csccccccccecs 164 Valise, Specially Built, for Motorcycle Side- OF Bb ade eC eta bau e sek C4OdS 9 4ORSS PEddas ade 539 Valve, Automatic Safety, for Boiler Water Se or ear 918 Valve Drains Water to Prevent Freezing... 353 Valve Extension for Disk Wheel Tires..... 789 Valve Key Tool Made from Scissors...... 925 Valve, Locomotive Slide, Changed to Piston Va kak Ghali eb aie Race > owed en Ae 573 Valve, Safety, for Fire Protection in Oil- CE gnc wekden eds dae we Wweee's 402 Se ee, SE. eo GWhd nes 6A eee wees eu R63 po ee ae ee 622 Valve, Tire, Utilized for Engine Cleaning. 294 Valves, Auto, New Device Accurately Grinds 72 Valves, Duplex Pump, Setting............. 776 Valves, Oxygen-Cylinder, Opening 302 Valves, Pump, Made Tight ..... NE ER Ae 787 Valves, Welding Torch, Should Be Exam- DD Lbnatanrenevskssephes bei banevhe kee ads 452 Vaporizer, Electric, Makes Auto Starting De hk ab Boas hb RA bes ee oud oes 6 eo ue oe 255 Varnish, Asphaltum, Preserves Window SP A eee ree 307 Varnish—Lacquer Sap from Trees.......... 266 Vere TOOUTOS, LAGE oc ic ccsacascveces 138 + aseline on Hands Aids Cleaning 945 —. Family, Premature Burial Prevented vEeRUy LPT Tee ee ETT eT CTT Te 47 V ault Withstands Tornado .......cccccoces 46 Vegetable and Fruit Drier.............. 953 Vegetable Oil Similar to Gasoline by Fre neh PEE at icaveb one COMER R eae eewene en eaes 651 Vegetable Selling “Direct to Consumer” Idea 284 Vegetables Dried by Heated-Air Convey- 2? i ce ccc eek eadee tare sen datiinas 422 Vegetation in Orinoco Delta, Oil-Killed Airplane Exploration Trip of............ 408 Vehicle—Wagon Loading, Right and Wrong EO sk sda de de ceeae ae s.od ee Ceh een ee ed 4 648 Wee, PUNO 5 poe kce sat eanenawans es 438 Veneer Cutter Blades, Acetylene Torch Cuts DIE Seca s a is aa aaa ie win im ma Bee 11 Ventilation, Getting Extra, in Lower Berth i eis anced aes 50nd ae ee eek eae 935 Ventilation, Forced Air, for Fruit Ships... 332 Ventilation—Steam Radiator Supplies Heat- Oe WN Fe ge ebb cance cae eistederddosses 100 Ventilator, Draftless, for Henhouse........ 275 Ventilator, Skylight, Opened by Gravity... 911

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40 POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Ventilators for Small-Light Windows...... Venus, Planet, Photographed in Daylight.. Veranda, Large Home, Made of Stream Che ERE EER ROAM ARERRA ROO LS Views, lllustrated, Shown with Music on EEE cnc as czstvececcdecrvaceterece vanes, Indian, Walpi, Arizona is One of ee SURO IM TU. Bin wwccccisersccseccoces Village, North American, in South America Vines Trained Over Umbrella-Shaped WUMOPWOEE, ch cccccsesecsccecesscescsonse Violin, One Stringed, with Horn........... Violin String Adjuster Changes Quickly. Viper Killing a Business Te SUG. BMS < ccccscncecsesonseevesnes . Vise, Milling Machine, Center Finding of PE MEE 0 cc cseeslaness s6seserceseons bbe ~~ Used as Fixture for Milling and Drill- Visee Woodworker's, Parallel Jaw Attach- PEROT rc eee Vision, Center of, Not Always Most Sensi- tive te Light. by C. A. Briggs. ..csceces Weenmeines, By ©. A, BAER. 0c ccccccssvens Volcanic Ash Rock “Tufa” Handled Like Lumber, by Horace E. Thomas........... Volcanic Power to Be Used in Hawaiian Is- IRS ooo io ds ino ein Ohl Wishes Wik lo Ak Bea Be we ae ae Volcano, Extinct, Was Burial Place of An- cient Hawaiians Volcano, “Smoking Mountain Airplane NN EE EOE PEO ee reer Vulcanizing Process, New, with Fusible Metals ee oo Ee ee ee — Hot, Motorcycle Equipped for Sell- i Cis eeRw ke ACE A OMe RADARS AC aw ee's ee Wagon, Right Way of Loading WOMOR Wheel Greasine ..ccccccccescvesocs Walk, Ornamental Garden, Made of Con- I = id Sd a ah bsg re a Ae AG wd e 060 hie ee See GP owe ahenresctveneneuss Walks, Concrete, for School Built by Pupils Wall, Brick, Trick of Walking Through... Wall, Coal Pile, Made of Sectional Hollow ET: Sipiws kha a b5:0 aed wake nko thee ous 9s 0 4 Wall, Height Increasing, Dog Jumps “— ee Brick, from Regular. : Size ee | wall “Partitions, New Flexible Material for Wallboard for Fret-Saw Work............ Wallis, Concrete, Protect Coast Erosion.... War Fields to Be Marked by Relief Maps.. War Heroes, Illuminated “Roll of Honor” i 2 i Se. ans sewed cans eeee ee War Incubus, The, by H. H. Windsor...... bes -4 Monument, World, Concrete Band Stand War Secreis Good Subjects for Peace Pub- DDSx Saadeh Nee ede kata ae waae Wee ew eae ae War Signals Secret, of Germans, by C. A. as hc: do 2a 05 Gig a hah in laine serie mA War Teciment of a Dollar-a-Year Man, by H. ER Se War Veterans, Crippled, Swimming Exer- cise for ee ee Ns Si a Sahl ach eee 8. fe ash ssn ak ct pe NK dm Warfare, Realistic Marine, on Stage, by Harry A. Mount ...... Warming Plate, Electric ..........c..cccece Washboard, Removable Surface ........... Washbowl, Fountain, Sanitary Economical Washcloth Holder Made from Clothespin.. Washer, Adjustable Spacing, for Milling en eamen Washer, Lens, rer. be = mt Photographic Print, Has Improved i Se A Lata aa ed wat n kes a0 obec oak aed Washer, Tiny, for Kitchen Sink........... Washers, Steel, Tools Made from Washing Machine, Aluminum Washing Machine, Display ................ Washing Machine Flywheel, Extra Weight on, Makes Operation Easier............. Washing Machine for Smal! Apartments.. Washing Machine, Toy Electric ..... Washrack, Garage, Lighting System for. Waste Cans Made from Old Range Boilers. Wastebaskets, Wire, Protect Light Globes.. Watch Calendar, Perpetual ee a? ee ee Y Watch Crystal, Unbreakable Watch, Electrically Driven ............... Watch, Split-Second, —_ Separate Read- AMNBBS ON occccccccccccccccccssccccces ° Wateh Springs Break “in Thunderstorms, Why, by C..A. BrigG..ccccccccccsscecere Watchman’s Clock ipetonn, Round-Record- PE nh s0 0s aces scence eseessovenberese Water Action ‘on Lead Pipe, Preventing... Water, Bathing Beach, Chlorine to Purify.. Re Water, Camp, Made Drinkable by New Tab- let Water Chisels Letters from pS PTT cee Water, Drinking, Purified Near Tidal Rivers Water Gauge, Boiler, Automatic Safety WN BE 00040 ek622 42h 0e5r OOk da eeARAR OSS Water Heater, Auto- Exhaust, for Tourists Water Heating, Outdoor ...........222000- Water Hyacinth Fought with Steam....... Water Jackets, Gas Engine, Cleaning...... — Mains, Old, Lead Calking Salvaged RPE Re a re Water Meters, ‘Testing Inaccurate WEEOF FiO COMO. cccceccscacrcsvvacertecs Water Pipe, Magnesia Deposit 3 ee Water Pipes, High Pressure Concrete, Used a Re. ne hwo 4 kad we tine eo bee Water Power Development Pushed in Aus- DL: 24506 0S sac 6K0C CRASS ETO ER SRS eS Water Supply, Surplus, Utilized for Power Water System, Cincinnati, Cleansed by Trav- Pe Ce co sccs cehnd dhe eeewade sien Water System, Complex, French Hydroelec- Rs! SO rr re ee Water Tank, Galvanized, for Kitchen Stove Water Tank Moved on Track Built Under It s . « Sere rere ryre rr Water Wheel Solves Problem of Cheap PE car cnddswendaeudesiabebaveemasewres Water Wings, Pneumatic Waterproofing Tents Wave-Length PE, an eeie ep ap aes 6869.6 04s 16 eee e ARs S Wave-Length Standards, Radio, Established with Quartz, by C. A. Briggs Tee, GR DOO ccc cctscesecsscececeses Waxer, Floor, Eliminates. Stooping Weather Bulletin for Airmen Weather Bureau Set, Toy Weather Forecasts, Wireless Station in CSPOCMERME GO ASD ciccccccccvccscesees ba pa Glass Holds Own Against Barom- ST Attees ceded Gdn eb aeatkedhenns ea we ss HO Weather Vane for Boathouse.............. Weed Burner for Railroad Tracks Weed Exterminator, Tractor Weed, Pennywort Classed as..........+++. Weed, Puncture, a New Pest for Motorists Weeder, Garden, Homemade..............- “ee Joints, Electrically, Tensile Streageh ee ao Welding, Holes Protected When........... Welding Short Bars Proves Profitable..... Welding Torch Valves Should Be Examined Well Bucket, Weighted ..................- Well Drained by Poplar Tree.............. Well Drilling to Drain Land, Wilcox ee ee Pe ee Measurements in Rare-Gas ee eee eee eee eeee ee re ee ee a | Ce well, Soll, “World's Most Inaccessible....... Well, Patagonian Oui, Gushes 1,300 Barrels nec gee aeges eee i meres Welis, Oil, Single Engine Pumps Many.... Wet Grinding a Dangerous Occupation.... Wharf Fenders, Automatic, Protects Ships Wharf, Floating, for Varying Water Levels Wheel Arrangement Aids Blind Wheel, Clamp Binds Car, to Railroad Track Wheel Greasing, Wagon ............ee-e00: Wheel Rims, Auto, Repaired on New Anvil Wheelbarrow, Folding Wheelbarrow Silencing ............... on Wheelchair Incline for Assembly | Wheels, Auto, Made of One Piece All Steel Pe Sn ec ccdenseadeneea Wooo. Resilient, Replace Pneumatic Truck ee T bf Self-Adjustable, for Different “Rail rrr ise eee Whiskey Tank, Eighty Gallon, in Auto.... Whistle, Airplane, on Auto Warns of Over- heating re see eee ewww ee 8 243 578

= Pee SS aS = = a !llU!l!lU sddceea aa 448 43

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POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Whistle Instrument Easy to Play White, Henry S.: Railway, Strange, for River-Boat mestage in The Congo Roof, —taramaat pany Theatre ... Wings, Transforms Lawn “into Rotary. “that ‘Fly without Flap- ci... PEPE E PEELS Drilling Wells to Drain BOE. gs ceaeeeeeOneNesdvanndsseencecives Will We Learn, by H. H. Windsor Willow Workshop, Roadside .............. Wind Direction, Peculiar Relation Between, and Ocean Currents that They —_ Up, ey Se. a: i cneeandeweneevsdeadece Wind Tunnel = Testing “Airplanes. oeeenee Winding Machine honed Electric Lamp Fila- PETRA UT LeU CLT TT Winding Machine, Rapid Armature........ Windmill Unaffected by Wind- _Seppennng Window Bars Prevent Accidents. Window Catch, Simple Window Closer, Automatic ....cescccescsce Window Curtains, Steel, are Bandit-Proof.. Window Display Cabinet Presents Lifelike DE tah ddmkn MAME Ree duu aaa hee aoe ee Window Display for Hosiery Sales........ Window Display, Miniature Circus Day is. Window Display—Vacuum Cleaner, Mechan- ical Woman Operates ping White-Plague “Clinic, Wilcox, W. F.: eee eene Window Display, Washing Machine........ Window Frames, Double Sash, with Screens MW: CORRRNOMOD 60 coos 68s ccveceeceocee eee OO. CD vices ewaehouennees au bad ed Panes, Frameless, Glass Handles SO asp isis oO tics ft te at Sat a al ak Gh vs eh Window Screens, Hook for Lifting........ Window Screens Preserved with Asphaltum NEE 4 ented ads ana Oe mate a khlemen are me Window Shade Bracket Accommodates Dif- ferent Lengths Cee ee eeeseeeseeeesrseseseses Window Shade Fixture Admits Light at YO I en ink ben diene dswkewe awd Window Shade Flapping, Preventing.. Window Window Window Squeegee, Small................06. Window View in Hotel Framed Like Picture Windows, Small-Light, Ventilators for Windows. Spring-Operated Alarm for Windshield, Auto, Shade Saving Device Draining Protector..... Windshield Cleaner, Auto, is Electrically RAPS E TS a 5 rere Windshield Sunshade, moves Glare Windsor, H. H.: ee Se Oot 6 hanewn da netee bene cb keane Automobile Sense, Getting Budget, The National Business Near, Better College, Execution, A Humane Learn, Will We Sunday “Reformers” Thanks, -Let Us Give Tribute, A Silent War Incubas, The _. OR DO Ree ee ee ere Wing-Load Indicator, Airplane............ Wings, Rotary, that Fly without Flapping, by Henry S. White Winters, Crewless Battleship Oper- "Ek 2 errr eee Wiping Solder and Babbitt, Heating... sss Wire and Cable Stringing Along Right of 0 Pare See re er ee Wire Attaching to Cement Posts........... Wire, Barbed, as Concrete Reinforcing Wire, Bismuth, eeReRieE in United IER. | Cn bin Ga A a Re SRN Cee O60 0S awe wo Wire Screens Protect. -. | eee Wire Stranding, Tension Regulator for. Wire Stretcher, Positive Grip.............. Wire Walker Goes Back on Trip Across RR ror eT eer eT eer ere Wire Wastebaskets Protect Light Globes... Wire Wringer Cleans and Drys Mop with- Se TOG. wce cde cach eAbs os eeceuceess Wireless—Aerial, Concealed Loop Wireless Aerial Mast, Insulating........... Wireless Aerials, Construction of.......... Wireless Amateurs, French, Use Crystal De- tectors ee ee ee eee ereeeeseseseesee eee teers eer e eee esese ee ee ed es Ce ee ee a Shutters as Dining Room Paneling 7 234 Wireless Apparatus Shows Vast Improve- PPP rrTTTTTTeerT rer iLirirerirt re Wireless, Audion-Bulb Fuse for............ Wireless—Audion Receiver, Short-Wave _ MOMGTREIVO sc ciccscecseccessecccscess Wireless Compass, Lighthouse * BY SOM We MOGBe ccocccccccececcesvscccce Wireless Controls Automobile Scand anh eee Wireless, Crewless Battleship Operated by, by S. R. Winters ee ee and Amplifiers, Combin- Se ee Wireless Displaces Phone in Remote Places Wireless Equipment, Elaborate, for White i De neces asics wees ts bbe keeehs Fee's Wireless Grounds, Tested ......... Wireless Loud Talker, Home-Made......... Wireless Megaphone for Baby Carriage.... Wireless Mineral Detector, How to Make... be ep Pastorless Church Hears Service Wireless, Phonograph Music by .......... Wireless Phonographic Suitcase Reproduces Pn De cece acceens eee bar sakenaeens Wireless, Portable West Coast, Catches At- lantic Signals Wireless “Radio Wireless Wireless Wireless Wireless Wireless Wireless Receive r, DE ccticsceedstatenasteneaes Receiving Set for Doctor's Car.. Receiving Set Uses Tesla Coupler Receiving Set Weighs Five Pounds Receiving Station in Scotland.... Receiving Tuner, Space-Saving... Station for Interfactory Communi- DL. ,tcncsndhe caren heh nee do see eee eke a Wireless Station, Greenland, to Aid Weather i eine Kena die h dean wee ed weaken Wireless Station Proposed Near Vancouver Wireless Stations, Fourteen, to Be Erected ) 2A re rete Wa Wissiess Telegraph Safeguards Auto...... Wireless Telegraph Towers Highest on Pa- RE Sine 2k edn Maia ns a haa ain a Re Wireless Telephone, Balloon Marriage by. Wireless Telephone Communication DE BORER 6.5 94s eenewensnceedseenees eee Wireless Telephone in Fire Chief's Car.... Wireless Tower, Highest, is Made of Con- GEGES 6.666 60000 e sede tends edeseedsceseonss Wireless Wave-Length Standards Estab- lished with Quartz, by C. A. Briggs...... Wireless Waves Do Not Lean Over, A. Briges ee Wires, Protecting Headlight............... Wires, Temporary Electric, Portable Rack Supports Wiring, Water-Tight, Lead Alloy Sheath for Woman, Mechanical, Operates Window Dis- ee TORU CGO ccc cecccctessescese Wood as a Crop, by H. H. Windsor Wood—Birch, Ebonizing ...........ceeeeens Wood, Brazilian, Features of, for Furniture Woes Bumpers for Awtes. ...cccccsssvessss Wood Chain Portiere Carved with Penknife Wood, Determining Moisture Content of.... WrO OME GI ccsdccsnsecsnecéeeessec Wood—Floor, Oak, Finishing.............. Wood Forms, Irregular, Duplicated in Lathe Wood—Hardwood Pulp, Paper Made from.. Wood Joints Held Fast by Steel Grins...... Wood, Large, Tested by Huge Machine Wood Lathe, Enormous, for U. S. Govern- SE ic cdcthacasdegonseneséeoenceerasauns Wood—Lumber, Northwest, Reaches High WU. once stank OOM DRO e NAS 86 86-0 ee wae en Wood Made into Charcoal, with Engine Ex- ee CE Lubec dee esheSeewsevense wanda dc Wood Molds, Killing se eee teense Wood—New Preservative Prolongs Life of PERE GRRE Ee eee eee ee er ee Wood, New South Wales Traffic Bridge DN GE avévubstuechteéutuaesseetceaebens Wood Planks Displace Steel Side On PEGE GOED cc cccccbcecev wes twrnsaveess Wood—Posts, Round and Split, Durability of Wood Preservation Information Bureau Es- tablished Wood Pulp Decay Prevented by Antiseptics 3 Wood, Removing Glue Stains from......... Wood Seasoning Methods to Be Studied..... Wood Tanks, Stopping Leaks in............

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42 ° POPULAR MECHANICS INDEX, VOLUME XXXVI, 1921 Wood—tTimber, First and Second Growth, a a aa ah. af Ga: vee mh ee EN ek Sa ik aw ars Sa ew 850 Wood Treated for Alcohol Yields Fifty Per Jo GE See 890 Wood Turning Tool, Improved.............. 611 Weed, Unteaging BinGgling.........seess;.. 929 Wood Waste Utilization Promoted by For- GUE ORTICG TIMGRGMMO 2c ccccaccvccinsscss 479 Wood—Willow Workshop, Roadside........ 746 Woodchuck and Hawk Good Friends....... 921 Woodwork, Waterproofing Laboratory....... 628 Wool, Limestone, Heat Insulators Made from 97 Wool Made Moth-Proof by Yellow Dye..... 817 Wool Processing, Mineral Oils Best for.... 732 Wool, Pulverized, Used in Many Industries... 539 Word-Building Contest Offers Prize........ 79 Word-Building Contestants Monopolize Li- on TS ara ree 799 Bo ES eee ee 796 Workshop, Willow, Along Roadside........ 746 Worm—Centipede, Wavy Motion of........ 223 Wrapping, Coin, and Counting by Automatic IN Ste eens, ee ee a i ie te igs 336 Wreckage, “Z R-2,” in Humber River....... 662 Wrecking and Salvaging Methods After Pu- IE 9 ia.c ics ard bia oi Gun ia aiw w/ate wad 2 @ eek 505 Wrecking Truck for Heavy Duty.......... 428 Wrecks: NR I Sd la eect bit eu ral ae aie ease 176 Airplane, Pilotless, Plunges into Tree..... 106 Airplane, Racing, Strain from Extreme OE FR re rae ere 877 Boiler, Steam, Vacuum Wrecks........... 197 Bridge, Hawaiian Concrete, Broke in Two I a Si cn rele eek nica Sap Wile dhibl es eae kin om 516 Building, Four-Story, Explosion Wrecks.. 59 Building Jammed by Electric Freight Car 653 Freight Cars, Eighteen, in Heap......... 839 Locomotive Dragged from Mud Grave by | Se RRR 514 Locomotive Throws Cow Against Switch et UE eck ds cas ewsaned read 519 Wrecks: (Continued) Subway Wreck, Paris, Causes Transformer Substation Wreck .......... “Z R-2’s” Fatal Flight, by Phil W. Hanna Wrench, Adjustable Spanner................ Se, GA SE MI keene canes a aces erences Wrench for Service Cocks............eesee-% Wrench Operated with One Hand........... Wrench, “S,” for Various Size Nuts......... Wrench, Spanner, Making An Adjustable... Wrench Takes AMY BiSO Mt. ccccvccovevurs Wringer, Clothes, Centrifugal Electric...... Wringer, Wire, Cleans and Drys Mop With- a SN cuts ewteasacdwee ee on Ke enews Wrist Pins, Worn, Bxpanding........sesces Writing Desk and Sewing Machine Combined Writing Desk, Library and Dressing Table Failure Signal ee ey en ere re ee ee X-Ray Amplifies Finger Prints............. X-Ray Discovers Stolen Rings Swallowed by SRE ai Pakhatiun WORE RO Ga ae ean wees Tey, BGUBISIRE TOO Oki 0 ccca sv kcinniseue X-Ray, Portable, Serves Patients at Home.. X-Ray Radiographs Objects 85 Yards Dis- RE. cane Meswen ae atPEEG ES EMAD OAS A Rea ESOS X-Ray—Radioscopic Examination of Mind A ae ee X-Ray Work Facilitated by Bubbles, by i ae SEE. WGkwa wake user ke ahesanee cae ne Yacht “America” Preserved by U. S....... Yacht “Delphine,” 17,000 Ton, Launched IE. aida aniarebie eS Oa ead ee aw ek Yacht, Ice, Building An—Part I. Hull Con- wg tC eT EPO eT Te Te Tarte TOOME, EAVES DOMOSE COG. ccccccccccsecewsess Yeast Feed Not Good for Hens............. Yellowstone Park Photographed by Jack A. Bristol

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I919O G09 wt (OOOO ae an ae ii p—