Monthly Notices of the Royal Astronomical Society, Volume 50

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Priestley and Weale, 1890 - Astronomy
Includes lists of additions to the Society's library, usually separately paged.

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Page 159 - Rue's mechanism, which has afforded very admirable results in the production of specula 1 3 inches in aperture and 10 feet focal length, the perfection of which is enhanced by his practice of bestowing the same care and precision on every step of the figuring of the speculum, from, the grinding, the smoothing on a bed of hones, or rather a slab of slate cut into squares, carefully brought to the same figure, and to the figuring of the polisher itself, which being thus previously rendered almost perfect,...
Page 161 - ... fixed) to get the other. Nothing can surpass the impression of real corporeal form thus conveyed by some of these pictures as taken by Mr. De la Rue with his powerful reflector, the production of which (as a step in some sort taken by man outside of the planet he inhabits) is one of the most remarkable and unexpected triumphs of scientific art.
Page 374 - A Mechanical Theory of the Solar Corona." It stated that his investigations seemed to prove conclusively that the solar corona is caused by light emitted and reflected from streams of matter ejected from the sun by forces which in general act along lines normal to the surface of the sun ; these forces are most active near the center of each sun-spot zone. Owing to the...
Page 148 - THE SOUTHERN SKIES : a Plain and Easy Guide to the Constellations of the Southern Hemisphere. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With an Introduction and a separate Explanation of each Map. True for every Year.
Page 250 - The reduction of the latitudes of the spots is not yet completed. The result of these observations may be thus briefly stated. As we pass from minimum to maximum, the lines of the chemical elements gradually disappear from among those most widened, their places being taken by lines of which at present we have no terrestrial representatives. Or, to put the result another way — at the minimum period of sunspots when we know the solar atmosphere is quietest and coolest, vapours containing the lines...
Page 157 - XXVI. p. 1* WARREN DE LA RUE was born at Guernsey on January 18th, 1815, and was the son of Mr. Thomas de la Rue, the founder of the eminent firm of manufacturing stationers in London. He was educated at the College Saint-Barbe in Paris, where he remained until he returned to London to enter his father-s business. He subsequently succeeded his father as head of the firm, from which he retired in 1880. In the course of his conduct of the firm Mr. de la Rue applied his scientific knowledge to purposes...
Page 254 - Spörer's case was taken up by Walter Maunder, superintendent of the Solar Department of the Royal Observatory Greenwich. In 1890 he reported to the Royal Astronomical Society—"For a period of about seventy years, ending in 1716, there seems to have been a remarkable interruption of the ordinary course of the spot cycle. In several years no spots appear to have been seen at all, and in 1705 it was recorded as a most remarkable event that two spots were seen on the Sun at the same time, for a similar...
Page 161 - Sccchi, has been pointed out by Mr. De la Rue, namely, that those portions of the moon's surface which are illuminated by a very oblique ray from the sun possess so little photogenic power that, although to the eye they appear as bright as other portions of the moon illuminated by a more direct ray, the latter will produce the effect called by photographers solarisation...
Page 312 - I have observed in my comet seeking a most remarkable small inky black hole in a crowded part of the Milky Way.
Page 166 - Commander of the Legion of Honour, Commander of the Order of St. Maurice and St. Lazarus, Knight of the Order of the Rose, Brazil ; is son of the late Mr.

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