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It is understood, of course, that the employment of a magnet, air current, or other interrupter, produces no effect worth noticing, unless the self-induction, capacity and resistance are so related that there are oscillations set up upon each interruption. I will now endeavor to show you some of the most noteworthy of these discharge phenomena.
As regards the cause of the phenomenon, Vaucher shows how rapid local alterations of atmospheric pressure would produce oscillations in the level of the lake, and compares them to the vibrations of a liquid in a recurved tube or siphon.
Hence, we may perhaps infer, that during the palaeozoic and secondary periods, neither continents nor continental islands existed where our oceans now extend; for had they existed, palaeozoic and secondary formations would in all probability have been accumulated from sediment derived from their wear and tear; and would have been at least partially upheaved by the oscillations of level, which must have intervened during these enormously long periods.
Yet, in spite of some curious experiments which seem to establish that the speed of light does alter a little with its intensity, we have reason to believe that, as regards light, the amplitude of the oscillations in relation to the wave-length is incomparably less than in the case of sound.
Let that section of public opinion stand aloof, soured and discontented, excluded from active life, lending no counter-balance to the perilous oscillations of democratic passion, and tell me if it is not an enemy to itself as well as a traitor to the principles it embodies?"
Not on any sanctioned by the Method of Difference; for one of the two instances, the negative instance, is wanting. Nor by the Method of Agreement; for though all pendulums agree in this, that during their oscillations the earth is always present, why may we not as well ascribe the phenomenon to the sun, which is equally a co-existent fact in all the experiments?
In fact, a little consideration in relation to the character of such shocks renders it highly improbable that such brief tremors of the earth's crust could have been any agency in the generation of rhythmical oscillations of the whole mass of water in the lake.
Descanting upon this congenial theme, the poet-novelist observes, in continuation, that while at first the vibrations of each bell rise straight, pure, and in a manner separate from that of the others, swelling by degrees, they blend, melt, and amalgamate in magnificent concert until they become at length one mass of sonorous vibrations, which, issuing incessantly from innumerable steeples, float, undulate, bound, whirl over the city, expanding at last far beyond the horizon the deafening circle of their oscillations.
And the oscillations of empires and kingdoms, religious movements, wars, invasions, settlements leave upon the mind an impression that the surplus life of mankind, the less-localised life of mankind, that life of mankind which is not directly connected with the soil but which has become more or less detached from and independent of it, is becoming proportionately more important in relation to the Normal Social Life.
The gentleman of the present day is superior to his forefather whom Fielding described: he is better read and better educated, and at the same time more sober and more chaste. The man of genius does not, then, by his oscillations of temperament, retard or misdirect the company whose course he points.
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