Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 585
FIG. 404.—SMALL DYNAMOTOR WITH BUSY-BACK ATTACHMENT. and dont-answer attachment and belted to an alternating currentmotor is shown in Fig. 405, this being a set used by the Stromberg-Carlson Company in one of their exchanges. Recently the Holtzer- … FIG. 405.-RINGING MACHINE WITH BUSY-BACK ATTACHMENT BELTEDTO ALTERNATING-CURRENT MOTOR. ■Cabot Company have perfected a low speed alternating currentmotor built specially for this purpose, so that the ringing machine 564 AMERICAN TELEPHONE PRACTICE. will run at the proper speed to give the required…
Telephone
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