The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 135
for con-necting an extra bell, to be rung in some other part of thebuilding. It is connected (if required) as a shunt to theinstrument bell, a 2-way switch being often used in conjunction,so that the extension bell may be cut out when not required to Hi PRACTICAL TELEPHONE HANDBOOK ring. A drop… … of the National Telephone Co.s form of wall-pattern instru-ment, and Fig. 116 gives the connections of the same, which,it will be observed, are similar to those of Fig. 113, exceptthat a hand-micro-telephone is used, SUB-STATION INSTRUMENT CONNECTIONS 113 Table Sets.—Fig. 117 shows a very popular…
Telephone
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