File:EB1911 Telegraph - Single-current Relay Working.jpg
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EB1911_Telegraph_-_Single-current_Relay_Working.jpg (515 × 381 pixels, file size: 28 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:18, 19 February 2016 | 515 × 381 (28 KB) | Library Guy | {{Information |Description ={{en|1=If long circuits were worked direct with ordinary instruments, high battery power would be required in order to send sufficient current to actuate the apparatus. In such cases it is usual to employ a local battery... |
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