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Page 421 - ... experiments no change was observed in the logarithmic decrement-amplitude curves. This absence of any effect led to the supposition that the damping was proportional to the amplitude, and independent of the velocity. The study of the elastic properties of such wires was continued by Guthe and the writer2 during the latter part of 1908 and the early part of 1909. In that work, wires containing different percentages of iridium were used. The apparatus was so constructed that much larger amplitudes...
Page 639 - ... different luminous flames and with different insects on succeeding days. In some of them especially luminous insect specimens were secured which with favorable conditions of the galvanometer, gave very measurable deflections on the latter. By a similar use of the glass to that described, it appeared that flames whose intrinsic brilliancy is nearly comparable to that of a point below the middle of the candle flame, and whose total brilliancy is as exactly as possible comparable to that of the...
Page 85 - I likewise call attractions and impulses, in the same sense, accelerative, and motive; and use the words attraction, impulse or propensity of any sort towards a centre, promiscuously, and indifferently, one for another; considering those forces not physically, but mathematically: wherefore, the reader is not to imagine, that by those words, I anywhere take upon me to define the kind, or the manner of any action, the causes or the physical reason thereof, or that I attribute forces, in a true and...
Page 85 - For I here design only to give a mathematical notion of those forces, without considering their physical causes and seats...
Page 27 - It states that the velocity of light in free space appears the same to all observers, regardless of the motion of the source of light or of the observer.
Page 80 - But who will lead me into that still more hidden and dimmer region where Thought weds Fact, where the mental operation of the mathematician and the physical action of the molecules are seen in their true relation? Does not the way to it pass through the very den of the metaphysician, strewed with the remains of former explorers, and abhorred by every man of science?
Page 88 - ATOM molecular science as it now exists. In the earliest times the most ancient philosophers whose speculations are known to us seem to have discussed the ideas of number and of continuous magnitude, of space and time, of matter and motion, with a native power of thought which has probably never been surpassed.
Page 39 - The velocity of light is independent of the velocity of the source. The third and last premise (F3), which we shall need states: The velocity of light does not depend on the velocity of the source.