The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 94
Fig. 58 RECEIVERS IN GENERAL USE 7i and Fig. 60 aDother, provided with an elastic rubber bandand buckle. Loud-Speaking Receiver.—Fig. 61. This is used for com- ; M ™ n^ I -mm ■P ■> * Fig. 59 munication between offices in the same building, so that callsmay be made without any call bell being… … Fig. 60 trumpet, and arranged so that it may be screwed to a wallor upright. 72 PRACTICAL TELEPHONE HANDBOOK General—The sizes of the different parts of receivers varyin different makes, but for those in general use the diaphragmsmay be taken as from about 9 to 12 mils in thickness (generally10),…
Telephone
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