The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 148
Jf MAGNETO BELL WITH INDUCTION COIL & CONDENSER TABLE TELEPHONE C.B 1 o J … Fig. 137 Fig. 138 vibration, and one on which a good light falls. Care shouldalso be taken that space is left for the user to hold the receiverto his ear, without his arm or the receiver coming into contactwith a side wall or other object. If a fixed transmitter isused, the height should be…
Telephone
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