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Show Inprrlns: tha I'linnngraph. On tho principle of tbo sounding board, which repeata a sound at ao short an Interval that the original and the repeated wavea Imprest tha ear In unison, a device called tbe poly-phono poly-phono baa recently been applied to the phonograph for the purpoto ot doubling tbe volume of sound Issuing from that Instrument A phonograph with the polypbona attachment ha two horns, each provided with a diaphragm and stylus. Not only Is the sound mads louder, but It quality Is Improved. |