Soap Bubbles And the Forces Which Mould Them Being a Course of Three Lectures D
Soap Bubbles And the Forces Which Mould Them Being a Course of Three Lectures D
C V Charles Vernon Boys
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I have now started the motor, and after a moment or two I shall have obtained the right speed, and this I know by blowing through the holes, when a musical note will be produced, higher than the fork if the speed is too high, and lower than the fork if the speed is too low, and exactly the same as the fork if it is right. To make it still more evident when the speed is exactly right, I have placed the tuning- fork also between the light and the screen, so that you may see it illuminated, and it...s shadow upon the screen. I have not yet allowed the water to flow, but I want you to look at the fork. For a moment I have stopped the motor^ so that the light may be steady, and you can see that the fork is in motion because its legs appear blurred at the ends, where of course the motion is most rapid. Now the motor is started, and almost at once the fork appears quite different. It now looks like a piece of india-rubber, slowly opening and shutting, and now it appears quite still, but the noise it is making shows that it is not still by any means.
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