File:EB1911 Telegraph - Universal Battery Working.jpg
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EB1911_Telegraph_-_Universal_Battery_Working.jpg (640 × 353 pixels, file size: 37 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:50, 22 February 2016 | 640 × 353 (37 KB) | Library Guy | {{Information |Description ={{en|1=In cases where “universal battery” working, i.e. the working of several instruments from one set of batteries or accumulators, is adopted, the positive and negative currents have to be sent from independent bat... |
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