File:EB1911 Telegraph - Closed Circuit, Single-current System.jpg
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EB1911_Telegraph_-_Closed_Circuit,_Single-current_System.jpg (431 × 320 pixels, file size: 25 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:10, 19 February 2016 | 431 × 320 (25 KB) | Library Guy | {{Information |Description ={{en|1=The connexions for single-current working on the “closed-circuit” system are shown. It differs from the open circuit in only requiring one battery (although, as in the figure, half of it is often placed at each... |
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