Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 379
Fig. 247.—Siren. in the quality of sound is due to overtones or secondarysound waves that accompany the fundamental or majorsound, and give it so characteristic a coloring that no twohuman voices, and no two instruments, even of the sameclass and make, ever sound precisely the same note. Froma… … Fig. 248—Helmholtzresonator. almost pure note, which, on account of its lack of shading,fails to be acceptable to the ear. Helmholtz was the firstto measure the quality of a musical note by measuring theaccompanying overtones. For thispurpose he devised his resonators(Fig. 248), hollow globes of…
Physics
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