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Boulders derived from the adjacent cliffs visibly cumber the sides of the river. Against these the water rises and sinks rhythmically but violently, large waves being thus produced. On the generation of each wave there is an immediate compounding of the wave-motion with the river-motion.
It remains to be stated that his assailant was Mr. Henry Brougham, afterwards Lord Chancellor of England. Wave-Motion, Interference of Waves, 'Whirlpool Rapids' of Niagara. Our hardest work is now before us. But the capacity for hard work depends in a great measure on the antecedent winding up of the will; I would call upon you, therefore, to gird up your loins for coming labours.
In this way we might proceed further, the general result being that, whenever the direction of wave-motion is such as to produce a marginal difference of path of an even number of semi-undulations, we have complete extinction; while, when the marginal difference is an odd number of semi-undulations, we have only partial extinction, a portion of the beam remaining as a luminous band.
Then the motion of the hand, before its final conversion into heat, would exist for a time as wave-motion, which, on subsiding, would generate its due equivalent of heat.
He discovered and explained classes of colour which had been previously unnoticed or unknown. On the assumption that light was wave-motion, all his experiments on interference were accounted for; on the assumption that light was flying particles, nothing was explained.
It was even then so new, to some, that it was proclaimed to be a demonstration of the existence of the ether itself, as well as a method of producing waves short enough to enable one to notice interference phenomena. It is obvious that Hertz himself must have had the mechanics of wave-motion plainly in mind, or he would not have planned such experiments.
This quality of elasticity, as manifested in such different degrees, depends upon molecular combinations; some of which, as in glass and steel, are favourable for exhibiting it, while others mask it, for the ultimate atoms of all kinds are certainly highly elastic. The measure of elasticity in a mass of matter is the velocity with which a wave-motion will be transmitted through it.
But without repeating the wandering talk of reality with its changeful tones, and however serious the matter might be it was never far from a touch of lightness shuttling in and out like sunshine, I told him, as we drove down the dark valley, my hand resting now on his shoulder near me, how nature is antipodal to the soul; or, if not the antipodes, is apart from us, and cares not for the virtues we have erected, for authority and mercy, for justice, chastity, and sacrifice, for nothing that is man's except the life of the body itself, the race-life, as if man were a chemical element or a wave-motion of ether that are parts of physics.
Here, in fact, we resolve the wave-motion into its elements, and having succeeded in doing this we shall have no great difficulty in applying our knowledge to optical phenomena. Now let us return to our slit, and, for the sake of simplicity, we will first consider the case of monochromatic light.
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