Tyndall, John, 1820-1893 · New York : Appleton · leaf 258
e thisintermittent action. Over thisgas-flame, f, Fig. 117, is placeda glass tube, a b, 6 feet long,and 2 inches in diameter. Theback of the tube is blackened,so as to prevent the light of theflame from falling directly uponthe screen, which it is now de-sirable to have as dark as possible. In… … 250 SOUND. my hand and cause the image to pass over the screen.Were the flame silent and steady, we should obtain a con-tinuous band of light; but it quivers, and emits at thesame time a deep and powerful note. On twirling the Fig. 117. U
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