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Courtesy of W. S. Gifford, American Telephone & Telegraph Co.

Fig- 153- Answering Time of Different Classes of Operators in Telephone Work

Cumulative curves of this sort give information in much more condensed and clear form than possible with other methods of presentation. This particular chart is read on a "less than" basis, as can be seen by the general position of the curves as related to the scales. Notice that none of the calls is answered in less than two seconds

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