Sound, 8 lectures

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Page 46 - ... the ratio of the specific heat of air at constant pressure to the specific heat at constant volume.
Page 240 - I cannot walk across the floor without agitating the flame. The creaking of my boots sets it in violent commotion. The crumpling or tearing of a bit of paper, or the rustle of a silk dress, does the same. It is startled by the patter of a rain-drop.
Page 55 - A stopcock was so constructed that it opened and shut the passage of a pipe 720 times in a second. Air from the wind-chest of an organ being allowed to pass along the pipe during the rotation of the cock, a musical sound was most smoothly uttered.
Page 241 - Her ivory forehead full of bounty brave, Like a broad table did itself dispread, For Love his lofty triumphs to engrave, ' And write the battles of his great godhead : All good and honour might therein be read; For there their dwelling was.
Page 231 - ... The jumping of the flame gradually increased, became somewhat irregular, and finally it began to flare continuously, emitting the characteristic sound indicating the escape of a greater amount of gas than could be properly consumed. I then ascertained by experiment, that the phenomenon did not take place unless the discharge of gas was so regulated that the flame approximated to the condition of flaring.
Page 12 - I do not say that the time required by the sound to travel through this tube is immeasurably short, but simply that the interval is too short for your senses to appreciate it. To show you that it is a pulse and not a puff of air, I fill one. end of the tube with smoke of brown paper.
Page 43 - I have been able to hear very plainly the beating of a man's heart; and it is common to hear the motion of the wind to and fro in the guts and other small vessels: the stopping in the lungs is easily discovered by the wheezing, the stopping of the head by the humming and whistling noises; the slipping to and fro of the joints, in many cases by crackling and the like. As to the working or motion of the parts one amongst another, methinks I could receive encouragement from hearing the hissing noise...
Page 81 - I substitute this plain wooden tray; it is also rendered musical. Here, finally, is a harp, against the sound-board of which I cause the end of the deal rod to press; every note of the piano is reproduced before you. I lift the harp so as to break its connection with the piano, the sound vanishes: but the moment I cause the sound-board to press upon the rod, the music is restored. The sound of the piano so far resembles that of the harp that it is hard to resist the impression that the music you...
Page 5 - Had he been standing on the edge of a precipice, he would have fallen over ; had he stood in contact with a window, he would have broken the glass ; had he been close to a drum-head, he would have shaken the drum. We could thus transmit a push through a row of a hundred boys, each particular boy, however, only swaying to and fro. Thus, also, we send sound through the air, and...

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