The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 128
e arrester is of the saw-tooth form, ad-justed to the two brass-line terminal plates. It is necessaryto provide a good earth connection. Special Protection.—Where the lines are in the least likely tocome into the neighbourhood of heavy-current supply lines.,which are now very common, safety devices… … Fig. 105 106 PRACTICAL TELEPHONE HANDBOOK affording passage to a current of a strength which, if con-tinued for a few minutes, will raise the temperature of thincopper wire—such as that of bell coils, etc.—until it is hotenough to ignite surrounding materials. These are calledsneak currents in…
Telephone
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