Confined Sound
The íntensity oí eonfined sound ia finely illustrated at Causbrook castle, Isle of "Wifrlit. where there is a well two hundred feet deep and twelve feet in diameter, walled and lined with smooth masonry. Althotigh this is an unusual depth for a well even in the British islcs. yetwhen a pin is dropped into it the sound of the surface of the water one hundred and eightytwo feet below can be distinctly heard. In a cast-iron water pipe of Paris, which forms a continuous tube with only two slight crooks. and those near its middle, the lowest whisper at one end may bc distinctly heard at the other, although the pipe is three thousand one hundred and twenty feet in length. When some experimcnts in this line were buing conducled a pistol fired at one end of the tube ucUuilly blew out a lig'hted candle held at the other end and violently ejected the shavings. fcathera, paper, etc, which had been ]ila'i d in the eni of the ppe by the experimenters.
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Old News
Ann Arbor Courier