SPIRIT OF DISCOVERY.
The Colosseum.
The curious mechanism by which it is proposed to elevate the visiters at this emporium of wonders, is as follows: A large bucket or tank of water will be connected with a movable platform that any number of persons may be placed in equilibrium with its fluid contents, and directly a sufficient quantity of water is introduced to produce a preponderance in the tank, the persons stationed on the platform will ascend.—The Atlas.
Spots on the Sun.
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.
The Himalaya Mountains.
This vast accumulation of sublime peaks, the pinnacles of our globe, is so extensive, that a plane, resting on elevations 21,000 feet, may be stretched in one direction as far as the Hindoo Cosh, for upwards of 1,000 miles, above which rise loftier summits, increasing in height to nearly 6,000 feet more.
To make Gold Size.
Melt one pound of asphaltum, and pour into it another pound of linseed oil, rendered drying by litharge; add also to it half a pound of red lead or vermilion. When the varnish becomes thick or pasty, thin it by adding one pound, or a pound and a half of spirit of turpentine; as more is required in winter than in summer.
Indian Corn.
Mr. C. Hall Jessop, of Cheltenham, asserts that he "was the first who recommended the Indian corn for field culture in this country," which he did "in a letter to G. Talbot, Esq., of Guiting, seven years ago."
Polishing Stones.
The Hindoos polish all kinds of stones by means of powdered corundrum, mixed with melted lac. The mixture being allowed to cool, is shaped into oblong pieces, of three or four inches in length. The stone is polished by being sprinkled with water; and at the same time rubbed with three oblong masses; and the polish is increased by masses being used successively with finer grains.
Sensitive Plant.
Mr. Burnet and Mr. Mayo have found, that at the moment the sensitive plant is touched, so as to occasion motion, it changes colour. They have also found that when a sensitive plant has been made to droop, the part in which the moving power resides is blackened, so as to absorb the light of the sun; the restoration of the plant to its natural state is much longer in taking place.
Indian Mills.
In India, granite is hewn into hand-mills for grinding corn; two or four of which are a load for an ass or a bullock, and are thus carried to the bazaar for sale. These are the primeval mills of all countries, which are mentioned in Scripture, and are still common among all uncivilized nations.
Musk.
Dr. Davey, by some recent experiments, has proved that when musk, in admixture with quicklime, smells of ammonia, it is impure or adulterated; and further, that, to preserve it well, it should be made perfectly dry; but when it is to be used as a perfume, it should be moistened.
Loch Lomond.
Mr. Galbraith has recently determined the quantity of water annually discharged by the river Leven from the basin of Loch Lomond to be about 59,939 cubic feet per minute. Now, as 36 cubic feet of fresh water are very near equal to a ton, this gives 1,665 tons per minute; and, supposing the year to be 365 days, 5 hours, 40 minutes, the annual discharge, at that rate, will be 877,295,085 tons. But as the river was rather below its average height, one-third may be added to this result; and we have about 1,200,000,000, or twelve hundred millions of tons per annum.