Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 116
hen disturbed, produces a series ofcircular waves: the disturbance necessary to producethese waves is simply an oscillation up and down of thepoint 0. Let 7n nhe the position of the ridge of oneof the waves at any moment, and on n its position asecond or two afterwards. Now every particle of water.… … the wave m n ought to give birth to a series of circularwaves. This is the important point up to which Iwished to lead you. Every particle of the wave m n doesact in this way. Taking each particle as a centre, andsurrounding it by a circular wave with a radius equalto the distance between m n and…
Light
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