An ingenious individual in Providence has very recently succeeded, by means of a seven-feet telescope, constructed by himself, on a new principle, in bringing the entire image of the sun into a darkened room, upon a white screen, to the size of eight feet in diameter. He writes us that his astonishment was great when he perceived that every spot now upon the face of the sun, nine in number, was distinctly transferred to the screen, and was so plain that he could see every movement of them in their various and sudden changes. He says he could plainly discover that those spots were immense bodies of smoke, apparently issuing from volcanoes; and as they seem occasionally forced upward from the craters, now forming dense clouds, and now dispersing, considers those phenomena as accounting for the rapid changes of those spots. The escape of such a vast quantity of gas from the interior of the body of the sun would, he observes, as it surrounds that luminary, produce that bright and dazzling appearance which is the atmosphere of the sun. This theory may not accord with the opinions of others who have made observations on the subject; but the writer, at any rate, entertains the strongest belief of its truth. With the same instrument, which is but just finished, he has also examined the moon, and states his conviction that that body is covered with perpetual snow and ice, the dark spots discoverable on its surface being frozen seas, and the lighter spaces land covered with snow. Those circular places, which have a rising cone in the centre, he thinks are extinguished volcanoes, as no clouds are perceptible over the moon's face; which being covered with snow and ice, accounts, as he imagines, for its clear atmosphere, or for the absence of an atmosphere. This vast accumulation of ice and snow upon the moon's surface may be explained, the writer conjectures, by the nature of the moon's revolutions. He offers to construct instruments of the above description, by which these phenomena may be observed, at prices from 50 to 100 dollars; and at the same rate to furnish solar microscopes, on a new principle, with a magnifying power at 12 feet distance, of 5,184,000.—Boston Bulletin.
National Repository.
Nearly two hundred specimens of curious works in arts and manufacture have already been laid before the committee of this establishment; the opening of which will take place in a few days.
Iron Trade.
In 1820, the whole iron made in Great Britain was 400,000 tons: in 1827, it had increased to 690,000 tons, from 284 furnaces. About three-tenths of this quantity are of a quality suitable for the foundry, which is all used in Great Britain and Ireland, with the exception of a small quantity exported to France and America. The other seven-tenths are made into bars, rods, sheets, &c., of which a large quantity is exported to all parts of the world.—Repertory of Arts.
Indian Claystone.
In some parts of India, the claystone contains numerous small nodules or lumps of clay iron-stone, which seldom exceed the size of a walnut. These are picked up by the natives, and are smelted by means of charcoal in a very small, rude furnace, blown by the hand-bellows, common all over India, and still used in Europe by the Gipsies. Many of the hills composed of claystone are neatly devoid of vegetation; their surface being bare and smooth, and of a red or black colour. The soil produced by the action of the atmosphere is not very productive; and so liable is it, in some places, to consolidate, when deprived of its moisture, that, if it be not constantly cultivated, it soon becomes hard and bare, and checks all vegetation.
Public Improvement.
The spirit of general improvement pervades every part of the continent, and is even more active in France than in Britain. In Britain, the spirit of improvement is chiefly evinced in public works, and in the useful arts and manufactures, and its efforts are characterized much more by superfluity of wealth than by science or refinement: in Germany this spirit is evinced in public buildings, in a superior taste, in agriculture, and education—Gard. Mag.