The Correlation and Conservation of Forces: A Series of Expositions, by Prof. Grove, Prof. Helmholtz, Dr. Mayer, Dr. Faraday, Prof. Liebig and Dr. Carpenter. With an Introduction and Brief Biographical Notices of the Chief Promoters of the New ViewsD. Appleton, 1865 - 438 من الصفحات |
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الصفحة 360 - That gravity should be innate, inherent, and essential to matter, so that one body may act upon another at a distance, through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking can ever fall iuto it. Gravity must be caused by an agent acting constantly according to certain laws; but whether this agent...
الصفحة xxviii - How this metamorphosis takes place — how a force existing as motion, heat, or light, can become a mode of consciousness — how it is possible for aerial vibrations to generate the sensation we call sound, or for the forces liberated by chemical changes in tho brain to give rise to emotion — these are mysteries which it is impossible to fathom.
الصفحة 72 - Yet nature is made better by no mean, But nature makes that mean: so, o'er that art, Which you say adds to nature, is an art That nature makes. You see, sweet maid, we marry A gentler scion to the wildest stock, And make conceive a bark of baser kind By bud of nobler race: this is an art Which does mend nature, — change it rather; but The art itself is nature.
الصفحة 91 - I do not here consider. What I call attraction may be performed by impulse, or by some other means unknown to me. I use that Word here to signify only in general any Force by which Bodies tend towards one another, whatsoever be the Cause.
الصفحة xii - From whence comes the Heat actually produced in the mechanical operation above mentioned ? Is it furnished by the metallic chips which are separated by the borer from the solid mass of metal ? If this were the case, then, according to the modern doctrines of latent Heat, and of caloric, the capacity for Heat...
الصفحة 230 - ... animal body. Unfortunately, the difficulty of the experiments is still very great; but within those limits of accuracy which have been as yet attainable, the experiments show that the heat generated in the animal body corresponds to the amount which would be generated by the chemical processes. The animal body therefore does not differ from the steam-engine, as regards the manner in which it obtains heat and force, but does differ from it in the manner in which the force gained is to be made...
الصفحة 211 - ... communicated to it. And while we have pumped for perhaps a quarter of an hour to charge the gun, the force is expended in a few seconds when the bullet is discharged; but because the action is compressed into so short a time, a much greater velocity is imparted to the ball than would be possible to communicate to it by the unaided effort of the arm in throwing it. From these examples you observe, and the mathematical theory has corroborated this for all purely mechanical, that is to say, for...
الصفحة 206 - It would be impossible to give a history of these efforts, as the clearer heads, among whom the elder Droz must be ranked, convinced themselves of the futility of their experiments, and were naturally not inclined to speak much about them. Bewildered intellects, however, proclaimed often enough that they had discovered the grand secret; and as the incorrectness of their proceedings was always speedily manifest, the matter fell into bad repute, and the opinion strengthened itself more and more that...
الصفحة xv - 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.
الصفحة 223 - ... planet, we should find that it would require several cubic miles of such matter to weigh a single grain. The general attractive force of all matter must, however, impel these masses to approach each other, and to condense, so that the nebulous sphere became incessantly smaller...