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R. S. Phil. Trans., 1774. Ibid, 1783. Observations on the Spots on the Sun, etc., 4 degrees; London and Edinburgh, 1863. Periodicitat der Sonnenflecken. Astron. Nach. R.S. Phil. Trans. "Researches on Solar Physics," by De la Rue, Stewart and Loewy; R. S. Phil. Trans., 1869, 1870. "The Sun as Photographed on the K line"; Knowledge, London, 1903, p. 229. R. S. Proc., xv., 1867, p. 256.
A "coudé," of 23-1/2 inches aperture and 62 feet focal length was in 1890 installed at the National Observatory, and has served M. Loewy for his ingenious studies on refraction and aberration above all, for taking the magnificent plates of his lunar atlas. The "bent" form is capable of being, but has not yet been, adapted to reflectors.
If the ancient Chaldaeans gave to the planetary conjunctions an influence over terrestrial events, let us remember that in our own time people have searched for connection between terrestrial conditions and periods of unusual prevalence of sun spots; while De la Rue, Loewy, and Balfour Stewart thought they found a connection between sun-spot displays and the planetary positions.
The conclusions arrived at by photographic means at Kew were communicated to the Royal Society in a series of papers drawn up jointly by De la Rue, Balfour Stewart, and Benjamin Loewy, in 1865 and subsequent years. They influenced materially the progress of thought on the subject they were concerned with.
M. Loewy, the present director of the Paris Observatory, proposed to Delaunay in 1871 the direction of a telescope on a novel system. The design seemed feasible, and was adopted; but the death of Delaunay and the other untoward circumstances of the time interrupted its execution.
Since then we have the charts of Schroter, Beer and Madler , and of Schmidt, of Athens ; and, above all, the photographic atlas by Loewy and Puiseux. The details of the moon's surface require for their discussion a whole book, like that of Neison or the one by Nasmyth and Carpenter. Here a few words must suffice. Mountain ranges like our Andes or Himalayas are rare.
Loewy and Puiseux, the selenographers of the Paris Observatory, are convinced that these great plains bear characteristic marks of the former presence of immense bodies of water.
Loewy and Puiseux, of the Paris Observatory, whose photographs of the moon are perhaps the finest yet made, say on this subject: "There exists, from the point of view of relief, a general similarity between the 'seas' of the moon and the plateaux which are covered to-day by terrestrial oceans.
They were designed to provide materials for an atlas on the scale of Beer and Mädler's, of which some beautiful specimen-plates have been issued. At Paris, in 1894, with the aid of a large "equatoreal coudé," a work of similar character was set on foot by MM. Loewy and Puiseux.
A differential method of determining the amount of aberration, struck out by M. Loewy of Paris, avoids most of the objections to the absolute method previously in vogue; and the upshot of its application in 1891 was to show that Struve's constant might better be retained than altered, Loewy's of 20·447" varying from it only to an insignificant extent.
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