File:NIE 1905 Telegraph - polarized relay.jpg
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NIE_1905_Telegraph_-_polarized_relay.jpg (623 × 471 pixels, file size: 70 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:08, 17 August 2017 | 623 × 471 (70 KB) | Bob Burkhardt | {{Information |Description ={{en|1=Drawing of the polarized telegraph relay.}} |Source =“Telegraph,” ''The New International Encyclopædia'', v. 19, 1905, p. 95. |Author =unknown author |Date =published 1905 |Permission... |
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