Common Science

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264. A drum makes a loud, clear sound when the tightened head is struck. 265. The pull of the moon causes the ocean tides. 266. Sand is sometimes put in the bottom of vases to keep them from falling over. 267. It is difficult to understand clearly the words of one who is speaking in an almost empty hall. 268. The ridges in a washboard help to clean the clothes that are rubbed over them. 269. One kind of mechanical toy has a heavy lead wheel inside. When you start this to whirling, the toy runs ...for a long time. 270. If you raise your finger slightly after touching the surface of water, the water comes up with your finger. SECTION 30. Pitch. What makes the keys of a piano give different sounds? Why does the moving of your fingers up and down on a violin string make it play different notes ? Why is the whistle of a peanut roaster so shrill, and why is the whistle of a boat so deep ? Did you ever notice how tiresome the whistle on a peanut roaster gets? Well, suppose that whenever you 1 86 Common Science spoke you had to utter your words in exactly that pitch ; that every time a car came down the street its noise was like the whistle of the peanut roaster, only louder ; that every step you took sounded like hitting a bell of the same pitch; that when you went to the moving- picture theater the orchestra played only the one note ; that when any one sang, his voice did not rise and fall; in short, that all the sounds in the world were in one pitch.

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Common Science
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