Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 405
ve thought that these soundlesszones were caused by the interference of the waves coming S82 LECTURE V] directly from the fog signal with waves reflected from thesurface of the sea. Our invaluable sensitive flame enablesus to test this theory. Observe, in the first place, theinfluence of reflection… … tween a and c I now introduce a smooth deal board p o.By the addition of the waves reflected from the board tothe direct waves, the flame is violently agitated. (In thefigure the steady flame is shown in combination with theagitated flame.) When the board is removed the flamebecomes still, whereas…
Sound
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