Show sound the intensity of confined sound is finely illustrated at causbrook castle isle of wight where there is a well two hundred feet deep an ac twelve feet in diameter walled and lined with smooth masonry althou although gli this i is an unusual depth for a well ex c en n i the british isles yet when a pin is itji suspend ped into it the sound of striking the surface of the water one hundred and eighty two feet below can be distinctly heard in a cast iron water pipe of paris which forms a continuous tube with only two slight sligh t crooks and those near its middle the lowest whisper at one end may be distinctly heard at the other although the pipe is three thousand one hundred and twenty feet in length when some experiments in this line were being conducted a pistol fired at one end of the tube actually blew out a lighted ca candle adle held at the other end and violent violently li ejected the shavings feathers paper etc which had been placed in the end of the pipe by bv the experimenters |