of the the Paris Exposition is the telegraphone invented point. The chain, shown at Z, serves to hold the mag- by the Danish engineer, Valdemar Poulsen. The wire. The ribbon, A, passes from one rollover a stand- principle of the apparatus will be understood ard mounted in the middle of the… … ces, in which he explained its principles. He goes a series of variations corresponding to Fig. 4.—POULSEN’S RIBBON TELEGRAPHONE. also noted an interesting experiment which the original sound waves. These magnetic has been made by his assistant, M. Pederson, pulsations act in turn upon the steel…
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