The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 574
a*TT£RY. Fig. 494.—Receiving Circuit, De Forest System waves is experienced even in the longest distances as is metwith in wire and especially in cable-wire transmission, so thatthe received words are very clear even though they may befaint. From this it follows that it is only a case of providing… … Fig. 495.—Transmitting Circuit, De Forest Wireless Telephone sufficient power and variation of power in transmission to enableeven the longest distances to be surmounted. A single trans-mitter can only cause variations on a current strength ofabout half an ampere and even with a multiple…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
