Tyndall, John, 1820-1893 · New York : Appleton · leaf 365
ffects produced when lightis reflected from ripples of water. When mercury isemployed the effect is more brilliant still. Here, by aproper mode of agitation, direct and reflected waves maybe caused to cross and interlace, and by the most wonder-ful self-analysis to untie their knotted scrolls. The… … produced by the intersection of direct and reflected waterwaves in a circular vessel, the point of disturbance (markedby the smallest circle in the figure) being midway betweenthe centre and the circumference. This power of water to accept and transmit multitu-dinous impulses is shared by air,…
Sound
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