Lecture-notes on Physics...: Pt. 1, Part 1 |
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abscissas apparatus astronomy atoms attractions and repulsions axis bubble capillary action capillary tube cause centimetres cohesion column compression concave constant convex cubic centimêtre curvature cylinder decimetres deduced determined diameter distance divided divisions effect electricity equal equations equivalent example experiments expression exterior feet film force Franklin Institute friction gases give glass gravity heat inch induction instrument inverse JOSEPH LECONTE Joule length liquid main scale matter mean temperature measure mechanical mercury method mêtre micrometer microscope millimètre minute mirror molecular attraction molecular pressure molecules motion moving body obtained ordinates pendulum phenomena phosphoric acid phosphorus physical placed plane plate porosity potential energy pressure exerted probable error produced Prof quantity radius of sensible result revolving screw sensible attraction sidereal day solid space spherometer square standard suppose surface theory thermal curves thickness tion toise Troughton & Simms velocity vernier vertical vibrations volume weight wire
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Page 74 - It is hardly necessary to add that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Page 63 - That the quantity of heat produced by the friction of bodies, whether solid or liquid, is always proportional to the force expended. 2. That the quantity of heat capable of increasing the temperature of 1 Ib. of water (weighed in vacua, and bet-ween 55° and 60°...
Page 74 - From the results of these computations it appears that the quantity of heat produced equably, or in a continuous stream, if I may use the expression, by the friction of the blunt steel borer against the bottom of the hollow metallic cylinder, was greater than that produced in the combustion of nine wax candles, each three-quarters of an inch in diameter, all burning together with clear bright flames.
Page 81 - The comparative cohesion of pure water and soap-water was determined by the weight necessary to detach the same plate from each; and in all cases the pure water was found to exhibit nearly double the tenacity of the soap-water.
Page 59 - ... become e; if, after the production of e, c still remained in whole or in part, there must be still further effects corresponding to this remaining cause: the total effect of c would thus be ¿ e, which would be contrary to the supposition c e. Accordingly, since c becomes e, and e becomes f, &c., we must regard these various magnitudes as different forms under which one and the same object makes its appearance. This capability of assuming various forms is the second essential property of all...
Page 75 - ... the tuning-fork was then vibrated, and its impulses transmitted to the rubber. A very perceptible increase of temperature was the result. The needle moved through an arc of from one to two and a half degrees. The experiment was varied, and many times repeated ; the motions of the needle were always in the same direction, namely, in that which was produced when the point of the compound wire was heated by momentary contact with the fingers.
Page 73 - Heat is a motion, expansive, restrained, and acting in its strife upon the smaller particles of bodies.
Page 4 - Herschel, regards what are called re$idml phenomena. When, in an experiment, all known causes being allowed for, there remain certain unexplained effects (excessively slight it may be), these must be carefully investigated, and every conceivable variation of arrangement of apparatus, etc., tried ; until, if possible, we manage so to exaggerate the residual phenomenon as to be able to detect its cause.