See Drandar, Le Prince Alexandre de Battenberg en Bulgarie (Paris, 1884); Koch, Fiirst Alexander von Bulgarien (Darmstadt, 1887); Matveyev, Bulgarien nach dem Berliner Congress (Petersburg, 1887); Bourchier, "Prince Alexander of Battenberg," in Fortnightly Review, January 1894.
On the 4th of April 1877 Emile Berliner filed a caveat in the United States patent office, in which he stated that, on the principle of the variation with pressure of the resistance at the contact of two conductors, he had made an instrument which could be used as a telephone transmitter, and that, in consequence of the mutual forces between the two parts of the current on the two sides of the point of contact, the instrument was capable of acting as a receiver.
Almost simultaneously with Berliner, Edison conceived the idea of using a variable resistance transmitter.
5 Schrader, "Die Sargonstele des Berliner Museums," in Abh.
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