. Annual report of the Board of Regents of the Smithsonian Institution . Fig. 20.—Note of orchestra : second. THE GRAMOPHONE REDDIE. 229. Pig. 21.—Gong : second. The first practical talking machine working on this principle wasmade by Mr. Short, who patented his invention in 1898. The A. Parsons then took up the invention, and considerably improvedit. I have a model here of the improved Parsons sound box (fig. 19).The auxetophone sound box as used to-day is on substantially thesame lines, though its construction has been simplified. Before closing this paper I should like to giv
. Annual report of the Board of Regents of the Smithsonian Institution . Fig. 20.—Note of orchestra : second. THE GRAMOPHONE REDDIE. 229. Pig. 21.—Gong : second. The first practical talking machine working on this principle wasmade by Mr. Short, who patented his invention in 1898. The A. Parsons then took up the invention, and considerably improvedit. I have a model here of the improved Parsons sound box (fig. 19).The auxetophone sound box as used to-day is on substantially thesame lines, though its construction has been simplified. Before closing this paper I should like to give you some detailsconcerning the sound line in a gramophone record, and show yousome magnified trac-ings of sound approximatelength of the spiralline in a fully recorded12-inch record, carry-ing the sound line towithin 2^ inches of itscenter, is tt timesthe mean diametermultiplied by the num-ber of turns—that is,•n- X 8 X 350 inches = 244 yards 1 foot. But this is the length of theline without the ripples. These at least double its length, if the pitchof the record is high and the sounds recorded rich in harmonics, soth
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