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Page 80 - Ganot's Elementary Treatise on Physics, Experimental and Applied, for the use of Colleges and Schools. Translated and edited by E. ATKINSON, FCS Seventh Edition, with 4 Coloured Plates and 758 Woodcuts. Post 8vo. 15.?.
Page 307 - The speaker then proceeded to investigate a number of different flames : he showed that there are many flames possessing a high degree of luminosity, which cannot possibly contain solid particles. Thus the flame of metallic arsenic burning in oxygen emits a remarkably intense white light; and as metallic arsenic volatilizes at...
Page x - Barometers with Brass Scales, extending from the Cistern to the top of the Mercurial Column, to reduce the observation to 32° Fahrenheit.
Page 57 - If we had evidence that the other lines which present themselves in the spectra of nitrogen and hydrogen were quenched on their way to us, we should have to consider their disappearance as an indication of a power of extinction residing in cosmical space, similar to that which was suggested from theoretical considerations by Cheseaux, and was afterwards supported on other grounds by Olbers and the elder Struve.
Page 308 - I found that gases of low density, which are not luminous at a given temperature when burnt under common atmospheric pressure, become so when they are simultaneously compressed. Thus mixtures of hydrogen and carbonic oxide with oxygen emit but little light when they are burnt or exploded in free air...
Page 58 - If the velocity of light he taken at 185,000 miles per second, and the wave-length of F at 486'50 millionths of a millimetre, the observed alteration in period of the line in Sirius will indicate a motion of recession between the earth and the star of 4 1 '4 miles per second. At the time of observation, that part of the earth's motion which was in the direction of the visual ray, was equal to a velocity of about 12 miles per second from the star. There remains unaccounted for a motion of recession...
Page 57 - If we had reason to believe that the other lines which present themselves in the spectra of nitrogen and hydrogen were quenched on their way to us, we should have to...
Page 55 - ... were not only of value for the more immediate purpose for which they had been undertaken, namely, to obtain information of the chemical constitution of the investing atmospheres of the stars, but that they might possibly serve to reveal something of the motions of the stars relatively to our system.
Page 56 - ... something of the motions of the stars relatively to our system. If the stars were moving towards or from the earth, their motion, compounded with the earth's motion, would alter to an observer on the earth the refrangibility of the light emitted by them, and consequently the lines of terrestrial substances would no longer coincide in position in the spectrum with the dark lines produced by the absorption of the vapours of the same substances existing in the stars.