File:Edison effect bulb 1.jpg
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Summary[edit]
| Summary | |
|---|---|
| Description | One of the bulbs Thomas Alva Edison used to discover thermionic emission (the Edison Effect) in 1884. It consists of an Edison incandescent lamp - an evacuated glass bulb with a hairpin shaped bamboo carbon filament - with an additional platinum foil electrode (center, inside the filament) connected to wire terminals. A current is applied to the filament, heating it. Edison found when he connected an ammeter between the filament and the auxiliary electrode, a current would flow, passing through the evacuated space of the bulb from filament to electrode. This current was later found to consist of electrons. This effect is the basis of vacuum tube technology, which dominated electronics for 50 years, until the 1970s. |
| Source | Wikimedia Commons file page |
| Author | Clayton H. Sharp |
| Permission | See original Commons license details. |
Licensing[edit]
Public Domain
This file is in the public domain and may be used without restriction.
Please see the linked source page for the original file history, attribution information, and licensing details.
Original attribution and file history: Wikimedia Commons
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:38, 8 June 2026 | | 215 × 401 (27 KB) | Maintenance script (talk | contribs) | == Summary == Importing file |
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