Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 316
ated by insulating material, and bound together ina cylinder to form the commutator marked C; the collecting brushesBB correspond to the copper and zinc poles of a voltaic cell. A gas or steam engine is usually the motive power for a dynamo;a common type is shown in Fig. 18 with the belt pulley at… … Fig. 18. One use of the machine, namely, to furnish current for a sys-tem of local instruments, is illustrated in Fig. 14, but its moreimportant function in telegraphy is the supply of the current forthe main lines. The different circuits to be supplied may vary inlength from 50 to 500 miles; and,…
Electrical engineering
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