The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 87
Fig. 46.—Scale \ clamping ring,which clamps thediaphragm in posi-tion. The case … beirl metal, there is not much differ-ence between the expansion of it andthat oithe magnet, so that the gapremains yearly the same with varia-tions of temperature. The Eric§on Receiver.—This re-ceiver, shownin Fig. ^7, is also builtup with a brass lase having an ebonitesleeve. The magnet is nxe(i…
Telephone
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