 | John Tyndall - 1867 - 404 páginas
...feet 4 inches. The fork is now detached from its case, so that when struck against its pad you hardly hear it. I hold the vibrating fork over this glass...its position, I pour water with the least possible noiseinto the jar. The column of air underneath the fork becomes shorter as the water rises. The sound,... | |
 | John Tyndall - 1867 - 372 páginas
...feet 4 inches. The fork is now detached from its case, so that when struck against its pad you hardly hear it. I hold the vibrating fork over this glass...its position, I pour water with the least possible noiseinto the jar. The column of air underneath the fork becomes shorter as the water rises. The sound,... | |
 | John Tyndall - 1875 - 628 páginas
...struck against a pad you hardly hear it. When held over this glass jar, AB, fig. 90, 18 inches deep, you still fail to hear the sound of the fork. Preserving...into the jar. The column of air underneath the fork shortens, the sound augments in intensity, and when the water has reached a certain level it bursts... | |
 | Alexander Wilford Hall - 1883 - 552 páginas
...feet 4 inches. The fork is now detached from its case, so that when struck against its pad you hardly hear it I hold the vibrating fork over this glass...into the jar. The column of air underneath the fork become* shorter as the water rises. The >ound,you observe, augments in intensity; and when the water... | |
 | Alexander Wilford Hall - 1877 - 546 páginas
...against its pad you hardly hear it I hold the vibrating fork over this glass jar, AB, fig. 87, 1 8 inches deep; but you still fail to hear the sound...underneath the fork becomes shorter as the water rises. The sound1, you observe, augments in intensity; and when the water reaches a certain level it bursts forth... | |
 | John Grier Hibben - 1905 - 472 páginas
...cause of resonance. " I hold a vibrating tuning-fork over a glass jar eighteen inches deep; but you fail to hear the sound of the fork. Preserving the...fork becomes shorter as the water rises. The sound augments in intensity, and when the water reaches a certain level, it bursts forth with extraordinary... | |
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This one, you will remember, vibrates 256 times in a second, the length of the sonorous wave which it produces being, therefore, 4 feet 4 inches. The fork is now detached from its case, so that when struck against its pad you hardly hear it. I hold the... 