File:EB1911 Telegraph - Marconi Electric Wave Detector.jpg
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EB1911_Telegraph_-_Marconi_Electric_Wave_Detector.jpg (622 × 191 pixels, file size: 18 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:24, 14 March 2016 | 622 × 191 (18 KB) | Library Guy | {{Information |Description ={{en|1=A glass tube having an internal diameter of about 4 millimetres has sealed into it two silver plugs PP by means of platinum wires WW; the opposed faces of these plugs are perfectly smooth, and are placed within a m... |
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