Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 585
eason for this was that all alternating motors available ran atsuch high speed that when direct-connected to ringing machinesthe frequency of the alternating current generated thereby was toogreat for properly actuating the bells. As a-result of this direct-con-nected machines were not used in such… … 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-
Telephone
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