The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 137
nced in our climate in keeping them clean.For this reason a form of table set has been recently intro- U4 PRACTICAL TELEPHONE HANDBOOK duced of a somewhat similar design, but in which all the parts,with the exception of the cradle switch and generator handle,are protected under a highly-decorated… … Fig. 118 similar kind of instrument is now used by the National Tele-phone Co. The Battery Switch-Bell.—For short private lines, and fortelephones between different parts of the same building,signalling is often done by means of batteries instead of bymagneto-generators, an ordinary trembler…
Telephone
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