The Purdue Engineering Review; The Annual Publication of the Engineering Societies of Purdue University Volume 7; V. 9-11

The Purdue Engineering Review; The Annual Publication of the Engineering Societies of Purdue University Volume 7; V. 9-11

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...identical although there are many minor differences due to the different character of the traffic. Hereafter in this paper the Toll and Long Distance work will be considered as identical. Curve No. I shows a Comparison of the speed of the service of the Express and Toll traffic handled in the Chicago Toll. Room. These curves are plotted with the time interval in minutes as abscissae and the percentage of the calls completed as ordinates. It will be noted from these curves that in five minutes ninety-six per cent of the Express business is cared for while only sixty-eight per cent of the Toll business has been disposed of. This indicates the relative speed of the two classes of service. In the completion of any Long Distance call. there are four types of switchboard, and therefore four different operators involved, not including distributing operators and checkers mentioned later. The "A" board in any office is the switchboard upon which the answering lamp and corresponding jack of the subscriber's line terminates. This lamp is located in front of an operator at the board so that she or the operator on either side of her can answer it readily. Generally speaking, only these three opera.t0rs have access to this line. The "B" board on the other hand is so arranged that any operator at the board can reach any subscriber's line in that particular office. The number of subscribers in any exchange is thus limited by the reach of the average operator. The modern exchanges of a large city are built to care for 10.500 subscribers. In completing a local call the operator answers the ' signal with the inside cord of an idle pair of the cords in front of her. Upon learning the number desired. she depresses the "call...show more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236822498
  • 9781236822499