Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 168
although Professor S. P.Thompson has been more or less successful in transmitting THE TELEPHONE. 155 articulate sounds by means of instruments of similar con-struction to those of Reis, it has only been by very carefullyadjusting the contact-breaking spring, and speaking to itvery softly, so as… … JT.^IIII 111^ llinfJlliliilllllM illllllHiqi| S*^ \ -COLLIS fc C8 \ Fig. 42. consisted of a double electro-magnet about six inches inlength, laid horizontally upon a wooden sounding-board.In front of the poles of the electro-magnet was placed aniron rod of elUptical section, attached to a wooden…
Electric industries · Electricity
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