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angle appears applied atmosphere attraction axis ball becomes bodies called cause charge colors column communication concave conductor consequently consists convex course cylinder described diameter diminished direction distance diverging double earth effect elasticity electricity electrified employed equal exhibited experiments extremity fact fall feet figure fluid focus force glass greater heat Hence inches incident increased insulated intensity iron kind length lens less light magnet magnifying manner means medium metallic microscope mirror motion nature nearly needle object observed opening opposite parallel passing pencil perpendicular phenomena piston plane plate poles portion position present pressure principles produced properties quantity rays receiver reflected refraction rendered respect seen separate side similar sound space spark steam string substance supposed surface telescope tion tube turned various vibrations weight whole
Page 22 - ... is equal to the weight of a column of water whose base is the section of the piston, and whose height is the distance of the level of the water in the barrel AC, above the level in the reservoir.
Page 70 - Nothing was ever written upon the subject of electricity, which was more generally read and admired in all parts of Europe than these Letters. There is hardly any European language into which they have not been translated; and, as if this were not sufficient to make them properly known, a translation of them has lately been made into Latin. It...
Page 63 - The first seven letters of the alphabet, A, B, C, D, E, F, G, are...
Page 258 - ... whence it follows, that the different thicknesses of the fluids at the places where the rings appeared, were nearly as 3 to 4 ; that is, in the ratio of the sine of incidence to the sine of refraction (Art. 749,) when the light passes from water into air.
Page 97 - he felt himself struck in his arms, shoulders, and breast, so that he lost his breath, and was two days before he recovered from the effects of the blow and the terror." He declared, that " he would not take a second shock for the whole kingdom of France.
Page 207 - But these equal angles are the complements of the angles of incidence and reflexion, which are also equal. Wherefore rays, parallel to the axis, will be reflected into the lines which all meet at one and the same focus.
Page 180 - That the best mode of tempering a compass needle, is first to harden it at a red heat, and then to soften it from the middle to about an inch from each extremity, by exposing it to a heat sufficient to cause the blue colour which arises again to disappear.
Page 246 - By absorbing the excess of any colour at any point of the spectrum, above what is necessary to form white light, we may actually cause white light to appear at that point, and this white light will possess the remarkable property of remaining white after any number of refractions, and of being decomposable only by absorption.
Page 323 - It is singularly adapted to optical purposes, having a refracting power about equal to that of the best flint glass, with a dispersive power more than double that of the same substance. It is, moreover, perfectly colorless, beautifully transparent, and although it is very volatile yet when closely sealed it possesses nearly the same optical properties under all required temperatures. The advantages of using sulphuret of carbon, should the experiments finally succeed as well as it is expected, are...
Page 182 - ... gradually weaker ; and this deterioration is most accelerated when its poles have a position the reverse of the natural one. Under these circumstances, indeed, unless the magnet be made of the hardest steel, it will in no long time lose the whole of its magnetic power. Two magnets may also very much weaken each other if they be kept, even for a short time, with their similar poles fronting each other. The polarity of the weaker magnet, especially, is rapidly impaired, and sometimes is found to...