Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 264
termittent action. Over thisgas flame/, fig. 122, is placeda glass tube A B, 6 feet long, Fig. 121. 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 pos-sible. In… … 242 LECTURE VI. my hand and cause the image to pass over the screenWere the flame silent and steady, we should obtain acontinuous band of light; but it quivers, and emits atthe same time a deep note. On twirling the mirror^Fig. 122.
Sound
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