The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 334
spectively. Motors. — Dynamo machines aregenerally reversible, so that if cur-rent is sent through the machinefrom some outside source, and thebrushes are in the proper position,the armature will be subjected to a torque —that is, a force tendingto drive it round. The machine then becomes a motor,… … EXT. CIRCUIT Fig. 310 306 PRACTICAL TELEPHONE HANDBOOK side source of current supply is available is to use the latterto drive a motor properly designed for the particular currentsupply, and to employ this motor to again drive a dynamo,also properly designed, to give out the current at the…
Telephone
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