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Page 174 - The Geology of Pennsylvania. A Government Survey, with a General View of the Geology of the United States, essays on the Coal Formation and its Fossils, and a description of the Coal Fields of North America and Great Britain. Illustrated with plates and engravings in the text. 3 vols. 4to, cloth, with portfolio of maps i5 oo ROSE (JOSHUA, ME) The Pattern-makers
Page 82 - Robinson, and Thalen, but that the application of this method enables them to be better studied, the metallic spectra being clearly separated from that of the gaseous medium through which the spark passes. Photographs of the spark, taken in air between zinc and cadmium and zinc and tin, accompany the paper, showing that when spectra of the vapours given off by electrodes are studied in this manner, the vapours close to the electrode give lines which disappear from the spectrum of the vapour at a...
Page 82 - 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 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...
Page 97 - The observations made by slitless spectroscopes during the eclipse of Dec. 11, 1871, led one of us early this year to the conclusion that the most convenient and labour-saving contrivance for the daily observation of the chromosphere would be to photograph daily the image of a ringslit, which should be coincident with an image of the chromosphere itself. The same idea has since occurred to the other. We therefore beg leave to send in a joint communication to the Royal Society on the subject, showing...
Page 30 - Chair during the year, and for his Address, and that he be requested to allow it to be printed in the Quarterly Journal of the Society.
Page 483 - Let us conceive, then, of an Algebra in which the symbols x, y, z, &c. admit indifferently of the values 0 and 1, and of these values alone. The laws, the axioms, and the processes, of such an Algebra will be identical in their whole extent with the laws, the axioms, and the processes of an Algebra of Logic.
Page 393 - AR Results of the comparisons of the standards of length of England, Austria, Spain, United States, Cape of Good Hope, and of a second Russian Standard, made at the Ordnance Survey Office, Southampton.
Page 513 - ... and other engineering works in Scotland, chiefly under Messrs. Locke and Errington. In 1851 he established himself professionally in Glasgow, in partnership with Mr. John Thomson, with whom he revived the project of supplying Glasgow with water from Loch Katrine, and surveyed the proposed route. In 1855 he was appointed Regius Professor of Civil Engineering and Mechanics in Glasgow University ; and in 1857 was elected the first President of the Institution of Engineers in Scotland, in the formation...
Page 119 - When editing the English translation of Schellen's ' Spectrum Analysis,' I discovered that the short account of the method of viewing the forms of the solar prominences by means of a wide slit, which I had the honour of presenting to the Royal Society on February 16...
Page 120 - In the note the second slit was stated to have been placed before the object-glass of the little telescope. Such an arrangement was tried in connexion with some other experiments in progress at the time. The plan of limiting the field of view to the part of the spectrum corresponding to the refrangibility of the light of the prominence, as well as the employment of a ruby glass, is of value when the air is not favourable, or when a spectroscope of small dispersive power is used.