ad; if a sound is heard in either ear—the right equal length, the sound waves received from them of Hurst Castle. This latter is really a range of ear, for example—it shows at once that the sound will necessarily re-enforce each other, and the sound buildings used principally as a Lloyd's signaling… … Lieutenant-Colonel D. P. Heap, engineer of from three and a half to Ave hours. It will Fig. 1.—HEAP'S TOPOPHONE. Fig. 3—THE TOPOPHONE IN USE ) 1901 SCIENTIFIC AMERICAN, INC.
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