File:EB1911 Telegraph - Multiplex Working.jpg
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EB1911_Telegraph_-_Multiplex_Working.jpg (647 × 182 pixels, file size: 21 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:03, 23 February 2016 | 647 × 182 (21 KB) | Library Guy | {{Information |Description ={{en|1=The multiplex telegraphy system devised by Patrick B. Delany (which was adopted to a limited extent in Great Britain, but has now been entirely discarded) had for its object the working of a number of instruments s... |
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