This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...line and earth terminals, L, E, are secured to the outside of leather case, and have connected to them, on the inside, two metal strips, that make rubbing contact with two similar strips fixed on the ebonite frame. This enables the telephone to be removed from its case without disconnecting the line wires. The switch / ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...line and earth terminals, L, E, are secured to the outside of leather case, and have connected to them, on the inside, two metal strips, that make rubbing contact with two similar strips fixed on the ebonite frame. This enables the telephone to be removed from its case without disconnecting the line wires. The switch /, when not pressed, short circuits the secondary of induction coil, causing the incoming call buzz to only pass round the receiver coils, which is an advantage. The receiver, when not in use, rests on the leather flap that covers the cells. Speaking from experience, excellent results have been obtained with this telephone. It was invented by Lieutenant Medhurst of the Australian Army, where it is greatly used. To use this telephone, it is not necessary to remove it from its case; all that is necessary is to open the lid, and speak into the case. Fig. 59 shows the telephone in its leather case, and Fig. 58 shows it removed from case, with microphone capsule removed.1 Weight of this telephone, complete in leather case, lbs. It is made by the International Electric Company, 55, Redcross Street, London, E.C. Price, net, 1o.f. each. Field Work Earth Connections.--An earth connection should, if possible, always be made in damp soil. A pool of water or pond is an excellent earth connection, if time and material will permit you to make use of it. The best earth connection one can obtain, is a water or gas pipe, as they run under the earth for a great distance. If the soil is very dry and a tree is handy, for preference use the tree by driving an earth rod or metal peg into it, as the sap will make a good connection. Before making a joint in a wire, always be sure and remove the covering for about one and a half inches, then join the bared ends and ins...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
