The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 136
used, SUB-STATION INSTRUMENT CONNECTIONS 113 Table Sets.—Fig. 117 shows a very popular form of tableor desk instrument made by the Ericsson Co. of Stockholm.This firm is much to be commended as having introduced intothis country instruments which combine a considerableamount of artistic taste in… … Fig. 117 two-pronged cradle switch passes. The connections are shownin Fig. 118, this alsoshowing the centre point of the bell coilsconnected to earth. If this connection is not required forspecial signalling, it is omitted. Many of the parts of the above class of instrument arenickel-plated, and,…
Telephone
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