Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 569
power switch-board proper. An ammeter and a wattmeterare here shown for measuring the total current, and the total energydelivered to the power board. It is not the practice of the inde-pendent companies, as a rule, to furnish the wattmeter on thepower board, for the reason that this is usually… … 548 AMERICAN TELEPHONE PRACTICE. two of which extend through separate pairs of fuses to the single-throw, double-pole knife switches, B and C, controlling respectivelythe motors of charging machines, Nos, I and 2, the generators ofwhich supply direct current for charging the storage battery forthe…
Telephone
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