Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 170
wassupposed that each clerk would be able to pick out the twonotes which it was his business to attend to, and to trainhis ears so as to distinguish these while neglecting theothers. The plan might possibly be a success if telegraphclerks invariably possessed accurately trained musicalears, but… … Fig. 44. iS8 ELECTRICITY IN MODERN LIFE. shown in Fig. 45, were constructed, and these areof special interest as being the first pair of instruments that could really be saidto form a speaking tele-phone. They were exhi-bited in Philadelphia in1876, and at the meeting ofthe British Association…
Electric industries · Electricity
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
