File:EB1922 Telegraph - “G” relay.jpg
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EB1922_Telegraph_-_“G”_relay.jpg (737 × 599 pixels, file size: 74 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:41, 9 October 2019 | 737 × 599 (74 KB) | Bob Burkhardt | {{Information |description ={{en|1=In the original Gulstad relay the line coils were not differentially wound; it could be used, therefore, only on Bridge duplex or simplex circuits. To utilize the advantages of the Gulstad principal on differential duplex circuits, the British Post Office has modified the Post Office standard relay, by adding extra windings and terminals. This modified instrument is known as a “G” relay and is equally suitable for differential or bridge duplex working. The... |
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