File:EB1922 Telegraph - Polar Relay for Cable Telegraph System.jpg
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![File:EB1922 Telegraph - Polar Relay for Cable Telegraph System.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/0/06/EB1922_Telegraph_-_Polar_Relay_for_Cable_Telegraph_System.jpg/353px-EB1922_Telegraph_-_Polar_Relay_for_Cable_Telegraph_System.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:16, 22 October 2019 | ![]() | 877 × 1,487 (473 KB) | Bob Burkhardt | {{Information |description ={{en|1=Polar Relay for Cable Telegraph System.}} |date =published 1911 |source =“Telegraph,” ''Encyclopædia Britannica'' (12th ed.), v. 32, 1922, p. 703, fig. 9. |author =William Noble |permission ={{PD-Britannica}} }} Category:Telegraph instruments |
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