File:EB1922 Telephone - phantom circuit.jpg
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EB1922_Telephone_-_phantom_circuit.jpg (788 × 277 pixels, file size: 47 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:12, 13 January 2020 | 788 × 277 (47 KB) | Bob Burkhardt | {{Information |description ={{en|1=The difficulties encountered in working underground cable circuits were exhaustively investigated by the British Post Office in the first decade of this century, and it was proved that the inability to obtain phantom circuits was due primarily to want of balance between the electrostatic capacity of conductors in respect to (a) other conductors and (b) to earth. As a result of the earlier investigations the method of laying up the conductors in pairs to fo... |
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