The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 104
ons of thecarbon granules en-tangled among the fila- ^ ~^-^.ments. As the instru-ment is not altogetherfree from the packingtrouble, it is arrangedso that the transmitter /may be rotated a half-1turn occasionally, when \used as a fixed trans- vmitter. The Ericsson. — Thisalso is a highly… … Fig. 71.—Full size
Telephone
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