Sound: A Course of Eight Lectures Delivered at the Royal Institution of Great Britain

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Longmans, Green,, 1867 - 335 páginas
 

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Página 35 - ... the ratio of the specific heat of air at constant pressure to the specific heat at constant volume.
Página 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.
Página 45 - ... here the density being diminished, the elasticity remains the same. The velocity is directly proportional to the square root of the elasticity of the air, and inversely as the square root of the density. Sound, in fact, travels through different media with very different degrees of velocity; thus, starting with air as unity or one, the following velocities have been determined: Distilled water...
Página 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.
Página 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...
Página 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...
Página 81 - An artist is at this moment engaged at the instrument, but you hear no sound. I place this violin upon the end of the rod ; the violin becomes instantly musical, not, however, with the vibrations of its own strings but with those of the piano. I remove the violin, the sound ceases ; I put in its place a guitar, and the music revives. For the violin and guitar 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...
Página 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.
Página 140 - This suggested to me the idea of employing a violin bow to examine the vibrations of different sonorous bodies. When I applied the bow to a round plate of glass fixed at its middle it gave different sounds, which, compared with each other, were (as regards the number of their vibrations) equal to the squares of 2, 3, 4, 5, &c.; but the nature of the motions to which these sounds corresponded, and the means of producing each of them at will, were as yet unknown to me.

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