The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1873 |
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action æther amblygonite amplitude angle apparatus appear axis battery body bubbles calculated carbon carbonic acid centims centre chamber chromosphere circuit coefficient coil constant continued fraction corpuscules corresponding crystals curve deflection denote diameter distance distillate electric electromagnet electromotive force equal equation experiments feet flame flask force formula galvanometer give given glass grms heat inch intensity iron length light liquid magnetic maximum means measured mercury metal method millims motion Nicol prisms nitric acid observations obtained paper parallel Phil plane plane of reference plate Pleistocene Pliocene polarized pressure produced proper motions quantity radius rays resistance resonators salt sodic sulphate solid sound spectrum star substance sulphuric acid supersaturated solution suppose surface Table temperature theory tion tube vapour velocity vibrations Vlacq wave-length wire
Popular passages
Page 318 - 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 84 - ... is one of the best instruments for measuring temperatures. It is based on the principle of generating an electric current by the heating of a thermopile or thermoelectric couple.
Page 141 - There can be little doubt that in the observed stellar movements we have to do with two other independent motions — namely, a movement common to certain groups of stars, and also a motion peculiar to each star.
Page 141 - Vega, a Cygni, show a motion of approach. There are in the stars already observed exceptions to this general statement ; and there are some other considerations which appear to show that the sun's motion in space is not the only or even, in all cases, as it may be found, the chief cause of the observed proper motions of the stars*.
Page 144 - Since it appeared that the purest and densest vapour alone gave the greatest number of lines, it became of interest to examine the spectra of compounds consisting of a metal combined with a non-metallic 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...
Page 142 - ... 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 radial motion to a and /3...
Page 139 - Mg3 ; this amount of displacement would indicate a velocity of approach of 50 miles per second. To this velocity must be added the earth's orbital motion from the star of 5'25 miles per second, increasing the star's motion to 55 miles per second. When I can get favourable weather, I hope to obtain independent estimations from the lines of sodium and of hydrogen. a Lyra:.
Page 134 - My former observations show that these lines agree in position with two lines of the spectrum of hydrogen, that at F and the line near G. These lines are very narrow and are defined ; the hydrogen therefore must be at a low tension. The brightness of these lines relatively to the first and second lines varies considerably in different...
Page 141 - ... magnitudes. It seems not improbable that this part of the stars' motions may be larger than would result from Otto Struve's calculations, which give, on the supposition that the average parallax of a star of the first magnitude is equal to 0"-209, a velocity but little greater than one fourth of the earth's annual motion in its orbit.
Page 129 - In my early observations of the spectrum presented by the gaseous nebulae, the spectroscope with which I determined the coincidence of two of the bright lines respectively with a line of nitrogen and a line of hydrogen was of insufficient dispersive power to show whether the brightest nebular line was double, as is the case with the corresponding line of nitrogen. Subsequently I took some pains to determine this important point by using a spectroscope of greater dispersive power. I found, however,...