Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 186
ds free are also capable of vibratinglongitudinally, and producing musical tones. The investi-gation of this subject will lead us to exceedingly importantresults. Clasping a long glass tube exactly at its centre^and passing a wetted cloth over one of its halves, a clearmusical sound is the result.… … 164 LECTURE V. vided us with an instrument which will illustrate thisaction. A rod of brass, a b, fig. 85, is held at its centreby the clamp, s, while an ivory ball, suspended by twostrings from the points, m and n, of a wooden frame, iscaused to rest against the end, b, of the brass rod.…
Sound
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