Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 114
f they were in-dependent of each other (4).Thus by the combination oftwo progressive pulses, the onedirect and the other reflected, we produce two stationary^jidses on the tube a c. (1) (2) KODES AXD VEXTKAL SEGMENTS. 93 The vibrating parts a b and o c are called ventral seg-riients ; the point of… … (1) (2) (3) (4) (o) (6) (7) sion which follows the hump. The length of a wave,therefore, is twice that of a ventral segment. Suppose the jerks to be so timed as to cause eachhump to be one third of the tubes length. At the endof one-third of a second from starting the pulse will be in 94 LECTURE…
Sound
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