Image: Audion vacuum tube advertisement
Size of this preview: 800 × 542 pixels. Other resolutions: 320 × 217 pixels | 1,108 × 751 pixels.
Original image (1,108 × 751 pixels, file size: 251 KB, MIME type: image/png)
Description: Advertisement for the Audion vacuum tube invented by Lee De Forest in 1907, from The Electrical Experimenter magazine, August 1916, volume 4, number 4, page 228. This was the first triode, the first vacuum tube that could amplify electrical signals. It was used by amateur experimenters as well as commercial companies to build the first amplifying radio receivers, as indicated in the advertisement. By the time of this advertisement, improved versions were being sold by General Electric and other manufacturers, as shown by De Forest's efforts to differentiate his product.
Usage Terms: Public domain
Image usage
The following page links to this image:
All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise.
