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.