Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 25
els forwardacross the surface—the water simply swings to-and-fro, or rather up and down, in its place. Now thatthis has once been brought to your attention, youwill be able to distinguish between the two kinds ofmovement—the apparent motion of the waves as theytravel along the surface, and the… … Fig. 2. balls (Fig. 2) is arranged upon stems to which, inregular order one after the other, is given an oscillatorymotion up and down. Not one of these white particlestravels along. Each simply oscillates in its own place. I LIGHTS AND SHADOWS 9 Yet the effect is that of a travelling wave, or…
Light · X-rays
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