File:EB1911 Telegraph - Connexions for Double-current Working.jpg
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![File:EB1911 Telegraph - Connexions for Double-current Working.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/9/95/EB1911_Telegraph_-_Connexions_for_Double-current_Working.jpg/647px-EB1911_Telegraph_-_Connexions_for_Double-current_Working.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:35, 19 February 2016 | ![]() | 665 × 616 (83 KB) | Library Guy | {{Information |Description ={{en|1=The general arrangement of the connexions for double-current working; the galvanometer G is used for the purpose of indicating whether a station is calling, in case the relay sticks or is out of adjustment. The key... |
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