Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 590
that apply to the care of dynamo electricalmachinery in general will apply to charging, and ringing machinesin telephone work, l)ut on account of the nicety with which thesemachines are made and adjusted, if of the= proper type, an evenoreater amount of attention should be paid to their care. In… … FIG. 411.—HOLTZER-CABOT RHE(.)STAT. caused \>\ machines in the telephone lines. The brushes whenproperly set on a properly designed machine, will not cause noise inthe lines even when no choke coils are placed in the charging leads.It has l>een stated that the brush should be wide enough to…
Telephone
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