Wilkinson, Henry Daniel, 1857- · London : "The Electrician" Printing and Pub. Co. Limited ; New York : D. Van Nostrand Co. · leaf 221
in this state is of great use when speaking through a faulty portion of cable, when the signals in the ordinary course are weak and it is not desirable to increase the battery power. On the other hand, by the use of the auxiliary coil alone the instrument is rendered very dead-beat. This device has… … Water damping has also been used from time to time with considerable success. Fig. 97 shows the usual form of closed tube and interior. To a light brass frame, with a disc, D, rigidly fixed at one end, is fixed a spring, S, and a sliding piece, P. ‘The lower end of the silk suspension is attached…
Cables, Submarine
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