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| | Privateline.com: Early Work on Dial Telephone Systems by R.B. Hill (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-09-09) |
 | | Dial telephone systems derive their name from the use of a dial, or equivalent device, operated by a subscriber or operator to produce the interruptions of current that direct or control the switching process at the central office. |
 | | At each station, in addition to the telephone, battery, and call bell, were a reversing key, a compound switch, and a dial (Figure 2a) similar to that employed in dial telegraph systems, and bearing on its face the numbers corresponding to the different stations of the exchange. |
 | | For each of these steps, the calling subscriber dial arm made a corresponding advance until it encountered the brass plug which had been inserted in a hole, whereupon a change in the current strength took place, which stopped the distant connector on the proper terminal, and the desired connection was completed. |
| www.privateline.com.cob-web.org:8888 /Switching/EarlyWork.html (3615 words) |
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