The World of Sound; Six Lectures Delivered Before a Juvenile Auditory At the Royal Institution, Christmas, 1919
The book The World of Sound; Six Lectures Delivered Before a Juvenile Auditory At the Royal Institution, Christmas, 1919 was written by author Bragg, William Henry, Sir, 1862-1942 Here you can read free online of The World of Sound; Six Lectures Delivered Before a Juvenile Auditory At the Royal Institution, Christmas, 1919 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The World of Sound; Six Lectures Delivered Before a Juvenile Auditory At the Royal Institution, Christmas, 1919 a good or bad book?
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Sir Richard Paget observes that there is no noise unless the water is deep enough for the cavity to be formed in it. No doubt the reason ■why the drops falling in succession under the same circum- stances make notes of different pitch is that the form of the cavity is altered by slight changes in the shape of the drop when it reaches ,the surface, or in the form of the surface itself. A drop oscillates, as it falls, between a flattened and a pointed form ; and the shape of the KiG. 39. — A smoo...th dry shot falling into water with very little splash, (i) t (time) = o; (2) i=-oo2$ sec. {3) t = ■0080 sec. A "sheath" splash. 74 THE WORLD OF SOUND cavity must depend considerably on what form the drop has at the moment of striking. We have to remember also that the note of the cavity may possibly depend on the size of the opening which it has at the moment of sounding. If we make a model cavity in plasticine and find its note by blowing across the top, we observe that the note falls in pitch when we close in the opening more and more.
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