# Chart of Electromagnetic Radiations

- By: W.M Welch Scientific Company
- Date: 1944
- Classification: Photograph
- Credit line: https://www.flickr.com/photos/llnl/9403051123/
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Chart_of_Electromagnetic_Radiations.jpg)
- Rights: Public domain
- Picture: https://invisiblenetwork.ai/thumbs/commons/thumb/8/88/Chart_of_Electromagnetic_Radiations.jpg/1920px-Chart_of_Electromagnetic_Radiations.jpg
- Who can see it: Teens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

If you're into scientific antiques, you have to examine the details in this 1944 poster from the W.M Welch Scientific Company: "Chart of Electromagnetic Radiations." It was found tucked away in the back of an unused office years ago, but now hangs framed in a high-traffic hallway populated by Lawrence Livermore engineers.