STRY; AND MANUFACTURES Woks 2 EXE A Noes: | NEW YORK, OCTOBER 12, 1878. [eas20 pes Aaa (NEW SERIEs.] NEW ELECTRICAL DIAPASON. produce fractions of a tone to illustrate the phenomena of | with a single mirror, so that it was actuated by both tongues. BY GEO. M. HOPKINS. consonance and dissonance. To… … would operate continuqusly and produce both sounds and FRONT ELEVATION OF ELECTRICAL DIAPASON. ports an adjustable tube, which is parallel with the tongues, figures, I first arranged two reeds or tongues to be vibrated | mirror, and at first used the apparatus after the manner of | and has in one…
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