THE JOURNAL OF THE FRANKLIN INSTITUTE DEVOTED TO SCIENCE AND THE MECHANIC ARTS

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Seite 213 - The use of only three types would, at first sight, be commended for its simplicity ; yet the vast diversity of Nature's combinations involves the necessity of many multiples, and the formation of mixed types as proposed by Odling, in which the saturating power of the several parts is distinguished by the signs used in this paper. Valid arguments may be urged in favor of using at least five types, in each of which one-half the saturating power expended to form the molecule is derived from a single...
Seite 432 - Merrick, in the chair. The minutes of the last meeting were read and approved. The Actuary submitted the minutes of the Board of Managers, and reported that...
Seite 296 - The ordinary gaseous and ordinary liquid states are, in short, only widely separated forms of the same condition of matter, and may be made to pass into one another by a series of gradations so gentle that the passage shall nowhere present any interruption or breach of continuity. From carbonic acid as a perfect gas to carbonic acid as a perfect liquid, the transition we have seen may be accomplished by a continuous process, and the gas and liquid are only distant stages of a long series of continuous...
Seite 134 - Egypt, where he had studied, that the sun is the centre of the universe, and that the earth revolves around him once a year. Three and a half centuries later, Archimedes^ correctly determined the sun's apparent diameter, as between 27
Seite 335 - Kirchhoff's scale) which, though very faint to the eye, was found to be decidedly superior to F in actinic power. The photographic apparatus employed consisted merely of a wooden tube, about 6 inches long, attached at one end to the eye-piece of the spectroscope, and at the other carrying a light frame. In this frame was placed a small plate-holder, containing for a sensitive-plate an ordinary microscope slide, 3 inches by r.
Seite 232 - ... little thing amounts to nothing because the unsteadiness of the air and the maladjustment of the polar axis of the equatorial caused the image to shift its place slightly during the long exposure of three and a half minutes which was required, thus destroying all the details. Still, the double-headed form of the prominence is evident, and the possibility of taking such photographs is established.
Seite 270 - ... current and a magnet, the force acting on the conductor must be equal and opposite to that acting on the magnet. Every part of the conductor is therefore acted on by a force perpendicular to the plane passing through its own direction and the lines of magnetic force due to the magnet, and equal to the product of the length of the conductor into the strength of the current, the intensity of the magnetic field, and the sine of the angle between the lines of force and the direction of the current....
Seite 340 - I may add that in the telescope this group of spots, from their first appearance, exhibited a strong yellowish tinge, which appeared to overlie all the central portion of the cluster. So conspicuous was it that several persons, unaccustomed to astronomical observation, noticed it at once before I called their attention to it. The penumbra of the group was unusually faint.
Seite 296 - What is the condition of carbonic acid when it passes, at temperatures above 31°, from the gaseous state down to the volume of the liquid, without giving evidence at any part of the process of liquefaction having occurred ? Does it continue in the gaseous state, or does it liquefy, or have we to deal with a new condition of matter? If the experiment were made at 100°...
Seite 331 - ... were it not for the necessity of compactness. " The light from the slit, after passing the collimator, is transmitted through the lower portion of a train of 6 prisms of heavy flint glass, each 2J inches high, and having, as stated above, a refracting angle of 55°. A...

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