File:Lee de Forest - Thermo-microphone - St. Nicholas magazine.jpg
Jump to navigation
Jump to search
No higher resolution available.
Lee_de_Forest_-_Thermo-microphone_-_St._Nicholas_magazine.jpg (429 × 583 pixels, file size: 65 KB, MIME type: image/jpeg)
Captions
Captions
Lee de Forest, and a near view of his thermo-microphone, attached to the small end of a megaphone. Taken by P&A
Summary[edit]
| Description |
English: American inventor Lee de Forest stands next to his invention, the electro-microphone. Surrounding text reads (in part):
"De Forest conceived the idea of utilizing the flame to superimpose voice vibrations on electrical vibrations which could be transmitted as telephonic speech. Whereupon the ‘‘speaking flame’’ came into being, a flame in which were the ends of two wires and at which he talked and held conversation over the telephone as you do when talking to a friend over the wire." |
| Date | |
| Source | https://archive.org/details/st.-nicholas-v-50-n-12-1923-10-sas/page/1274/mode/2up |
| Author | Various |
Licensing[edit]
|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:01, 2 December 2022 | | 429 × 583 (65 KB) | LiteralHorses (talk | contribs) | Uploaded a work by Various from https://archive.org/details/st.-nicholas-v-50-n-12-1923-10-sas/page/1274/mode/2up with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
