File:EB1911 Telegraph - Duplex Working - bridge method.jpg
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EB1911_Telegraph_-_Duplex_Working_-_bridge_method.jpg (551 × 484 pixels, file size: 40 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:00, 22 February 2016 | 551 × 484 (40 KB) | Library Guy | {{Information |Description ={{en|1=The “bridge” method for duplex working of a telegraph line: instead of sending the currents through the two coils of a differentially wound relay or receiving Bridge method. instrument as in Frischen's method,... |
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