The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 145
Fig. 131 Fig. 132 wires of platinum cemented through the glass, and solderedto two small aluminium electrodes, as shown in Fig. 133.Like condensers, these cells have the property of allowingthe apparently free passage of rapidly alternating currentsbut of completely stopping any direct current. An…
Telephone
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