The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 487
no-meter, a standard condenser and adischarge key are required. Fig.434 shows the former, which is around brass box containing a largenumber of discs of tinfoil, each onelaid between somewhat larger discsof thin mica. Every alternate disc of tinfoil is con-nected to one of the two terminals on the… … Fig. 434.—StandardCondenser
Telephone
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