The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 106
e way when not required. This instrument is adoptedin common battery exchanges, and is very powerful. It is usual to allot a particular breastplate set to eachoperator in an exchange, the operator being responsible forits safe-keeping and cleanliness. Transmitter-Testing.—This is usually done… … Fig. 74 84 PRACTICAL TELEPHONE HANDBOOK condensers also of a capacity equal to that of the same sectionof line, the condensers being connected as branches to the coils,which are joined in series (as shown in Fig. 76) so that the whole
Telephone
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