Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 218
his substance, leavinga slit between them. On urgingair through the slit, the bandswere thrown into vibration, anda musical tone produced. Helm-holtz recommends the form shownin fig. 108, where the tube, in-stead of ending in a section at right angles to its axis,terminates in two oblique sections,… … J 06 LECTURE V. ing about an inch of the substance projecting beyond theend of the tube. Taking two opposite portions of theprojecting rubber in the fingers, and stretching it, a sHtis formed, the blowing through wliich produces a musicalsound, which varies in pitch, as the sides of the slit varyin…
Sound
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