File:Loupiote radio 1915.jpg
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Summary
| Description |
Français : Loupiote. Brevet français n°452657, octobre 1915. Triode militaire TM, douille en cuivre.
English: Early French military triode vacuum tube patent no. 452657, October 1915. The triode was invented by American engineer Lee De Forest in 1906, who held the rights, but in 1912 he let his French patent rights lapse due to lack of a $125 fee. The French government manufactured hundreds of thousands of these sturdy tubes, called the Loupiote, during World War 1. The tube consists of an evacuated glass bulb containing three electrodes: a heated filament, a fine horizontal tungsten wire, surrounded by a concentric helix of wire called the grid, surrounded by a concentric metal cylinder called the plate. |
| Date | |
| Source | Own work Scanné par F1jmm |
| Author | Photo d'un inconnue, anonyme. Unknown |
Licensing
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Note: In Germany and possibly other countries, certain anonymous works published before July 1, 1995 are copyrighted until 70 years after the death of the author. See Übergangsrecht. Please use this template only if the author never claimed authorship or their authorship never became public in any other way. If the work is anonymous or pseudonymous (e.g., published only under a corporate or organization's name), use this template for images published more than 70 years ago.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:59, 26 March 2012 | | 573 × 686 (214 KB) | F1jmm |
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