# IBM Selectric II typewriter

Bill Hammack uses slow motion video (high-speed camera) to show the motion of the type element of an IBM Selectric II typewriter. He described the mechanical "whiffletree" mechanism that does digital to analog conversion.

- Kind: Short
- Year: 2010
- Runtime: 3 min
- By: Hammack
- Genres: Science
- Archive: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:IBM_Selectric_II_typewriter.ogv)
- Licence or status: [CC BY-SA 3.0 us](https://creativecommons.org/licenses/by-sa/3.0/us/deed.en) (as the archive states it)
- Credit: Hammack
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/commons/12072366?play=1)