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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 488

An illustration from American telephone practice, 1905, leaf 488 — ^1 FIG. 341—SCRIBNER COIN-COLLECTING DEVICE. the advantage of simplicity. All of these boxes, however, imposea duty upon the operator which necessarily tends to slow down herspeed of working, thus producing what is called a drag on herwork. The fact that the operator, after receiving a call, is…

Telephone

Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.

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