The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 314
e. Resetting Heat Coils.—In some recent forms of protector usedin America the heat coils are so constructed that they can beused over and over again without repairs. In the Kaisling protector this is accomplished by making the heat coilsymmetrical, so as to be reversible. When the coil has… … Fig. 291a Side Elevation Plan Main Frame. Combination Protector and Fuse Strips APPARATUS-ROOM 367 In the Cook form the coil is pivoted, and is furnishedwith ratchet teeth. A spring is held outwards by one olthese teeth, but when the solder melts the coil moves round,and the spring is released. The…
Telephone
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