Philosophical MagazineTaylor & Francis., 1873 |
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Common terms and phrases
action æther amblygonite amplitude angle apparatus appear axis battery body bubbles carbon carbonic acid centims centre chamber chromosphere circuit clean coefficient coil constant continued fraction corpuscules corresponding crystals curvature curve deflection denote distance distillate dlog electric electromotive force equal equation experiments expression Fahrenheit feet flame formula fractional distillation galvanometer gaseous gases give given glass heat Hence inch intensity iron length light liquid magnetism maximum measured mercury metal method millims motion nitric acid observations obtained paper parallel Phil plane plane of reference plate Pleistocene Pliocene polarized pressure produced proper motions quantity radius rays resistance resonators rifling solid sound spectroscope spectrum star sulphuric acid supersaturated solution suppose surface temperature tension theory tion tube vapour velocity vibrations wave-length wire
Popular passages
Page 308 - It is inconceivable, that inanimate brute matter should, without the mediation of something else, which is not material, operate upon, and affect other matter without mutual contact; as it must do, if gravitation, in the sense of Epicurus, be essential and inherent in it.
Page 309 - That gravity should be innate, inherent, and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of any thing else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man, who has in philosophical matters a competent faculty of thinking, can ever fall into it. Gravity must be caused by an agent acting constantly according to certain laws; but whether this agent...
Page 309 - NEWTON'S Third Letter to Bentley, February 25th, 1692-3. " Nobody surely, in his sober senses, has ever pretended to understand the mechanism of gravitation ; and yet what sublime discoveries was our immortal Newton enabled to make, merely by the investigation of the laws of its action...
Page 135 - ... that star. Although it was not to be expected that a concurrence would always be found between the proper motions which indicate the apparent motions at right angles to the line of sight and the radial motions as discovered by the spectroscope, still it is interesting to remark that in the case of the stars Castor and Pollux, one of which is approaching and the other receding, their proper motions also are different in direction and in amount ; and further, that y Leonis, which has an opposite...
Page 130 - II /3 occurs in the space between two groups of strong lines where the lines are faint. On one night of unusual steadiness of the air, when the finer lines in the star's spectrum were seen with more than ordinary distinctness, I was able with the more powerful instruments now at my command to see a narrow defined line in the red apparently coincident with H a, and a similar line at the position of H ft.
Page 125 - ... through this small uncovered space the light passes to reach the slit. The accuracy of both methods of comparison, that by reflection and that by the spark within the tube, was tested by the comparison of the three bright lines of magnesium and the double line of sodium with the Fraunhofer lines b and D in the spectrum of the moon.
Page 137 - ... the spectra of compounds consisting of a metal combined with a nonmetallic element. Experiments with chlorides are recorded. It was found in all cases that the difference between the spectrum of the chloride and the spectrum of the metal was that under the same spark-conditions all the short lines were obliterated. Changing the spark-conditions, the final result was that only the very longest lines in the spectrum of the metallic vapour remained. It was observed that in the case of elements with...
Page 125 - This collimator is so constructed that, by means of a couplingscrew, any one of three spectroscopes can be conveniently attached to it. This apparatus performs admirably ; but it seemed to me desirable, for observations of great delicacy, to be able to dispense with reflection, and to place the source of the light for comparison directly before the slit. Formerly I accomplished this object by placing the spark or vacuum-tube before the object-glass of the telescope. The great length of the present...
Page 135 - The star ,/, indeed, appears to be moving from us, but it is too far from a to be regarded as a companion to that star. Although it was not to be expected that a concurrence would always be found between the proper motions which indicate the...
Page 125 - I therefore resolved to place the spark or vacuum-tube within the telescope at a moderate distance from the slit. For this purpose holes were drilled in the tube opposite to each other, at a distance of 2 feet 6 inches within the principal focus. Before these holes short tubes were fixed with screws ; in these tubes slide suitable holders for carrying electrodes or vacuum-tubes. The spark is thus brought at once nearly into the axis of the telescope. The final adjustment is made in the following...