The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 145
form ofthis system the ringer coils are used in place of the specialretardation coil, and a condenser is included in the primarylocal circuit, as shown in Fig. 132. Electrolytic Cell.—In place of the condensers shown in Fig. Fig. 130 122 PRACTICAL TELEPHONE HANDBOOK 131, Messrs Siemen sometimes… … 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
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-337-191.webp)
