Avery's Physical Technics and Teacher's Hand-book, to Accompany The First Principles of Natural Philosophy and The Elements of Natural Philosophy ...Sheldon, 1886 - 274 páginas |
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Avery's Physical Technics and Teacher's Hand-Book, to Accompany the First ... Elroy McKendree Avery Sin vista previa disponible - 2015 |
Avery's Physical Technics and Teacher's Hand-Book, to Accompany the First ... Elroy McKendree Avery Sin vista previa disponible - 2016 |
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acid amperes apparatus atmospheric pressure atoms battery binding posts body calories cells centre charged chemical decomposition circuit color conductor cork Daniell's Principles Deschanel's Natural Philosophy diameter distance draw earth electricity Encyclopædia Britannica energy equal ether ether waves Exercises experiment feet figure foot-pounds force Frick's Physical Technics ft.-Ans glass grams gravity Grove cell Hand-Book note heat units hole hydrogen inches Induction internal resistance kilogrammeters knob lamp lb.-Ans length lesser calories lever Leyden jar liquid luminiferous ether magnetic melted mercury molecules motion move number of foot-pounds ohms outer coat particles pass Phil placed plane plate polarized pole pounds Principles of Physics prism produced pupil rays refracted represent rubber solution sound substance surface Tait's Light temperature tension text-book tion transmitted tube vapor velocity volts water weighs waves weight wire
Pasajes populares
Página 56 - 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 into it.
Página 56 - Gravity must be caused by an agent acting constantly according to certain laws, but whether this agent be material or immaterial I have left to the consideration of my readers.
Página 271 - ... conceivable to regard it as having been always in existence ; but if we regard it rather as a candle that has been lit, we become absolutely certain that it cannot have been burning from eternity, and that a time will come when it will cease to burn. We are led to look to a beginning in which the particles of matter were in a diffuse chaotic state, but endowed with the power of gravitation ; and we are led to look to an end in which the whole Universe will be one equally heated inert mass, and...
Página 271 - Now, it has been well pointed out by Thomson, that, looked at in this light, the universe is a system that had a beginning and must have an end; for a process of degradation cannot be eternal. If we could view the universe as a candle not lit, then it is perhaps conceivable to regard it as having been always in existence; but if we regard it rather as & candle that has been lit, we become absolutely certain that it cannot have been burning from eternity, and that a time will come when it will cease...
Página 270 - Thus the universe would ultimately become an equally heated mass, utterly worthless as far as the production of work is concerned, since such production depends upon difference of temperature. Although, therefore, in a strictly mechanical sense, there is a conservation of energy, yet, as regards usefulness or fitness for living beings, the energy of the universe is in process of deterioration.
Página 268 - Experiments of this kind prove that the blue light sent to us by the firmament is polarized, and that the direction of most perfect polarization is perpendicular to the solar rays. Were the heavenly azure like the ordinary light of the sun, the turning of the prism would have no effect upon it ; it would be transmitted equally during the entire rotation of the prism. The light of the sky is in great part quenched, because it is in great part polarized.
Página 49 - We cannot conceive any further explanation to be either necessary, desirable, or possible, for as soon as we know what is meant by the words configuration, motion, mass, and force, we see that the ideas which they represent are so elementary that they cannot be explained by means of anything else.
Página 262 - ... to immature material. The description applies very well to the flowering state of U. puberula, and as I have collected this species in fruit also, with leaves fully expanded, *Bull. Torr. Club, 24: 228-236, May 29, 1897. probably in the identical locality from which Mr. Green secured his specimens, there can no longer be any doubt as to the identity of Elliott's plant. SISYRINCHIUM CAROLINIANUM Bicknell, Bull. Torr. Club, 26: 221. My. 1899 Common in dry soil, Clarke Co. My specimens, collected...
Página 5 - Let us suppose the molecules to be of such a size that at every second of time a hundred millions could enter. How long, think you, would it take for this small vessel to get full of air ? An hour, a day, a year, a century ? Nay, almost an eternity ! A time so enormous that imagination itself cannot grasp the reality.
Página 169 - ... of the coils on the armature. The commutator consists of segments of brass, secured to a ring of non-conducting material, carried on the shaft. These segments are divided into two thicknesses, the inner being permanently secured to the non-conducting material, and the outer ones, which take all the wear, are fastened to the inner in such a manner that they can be easily removed when required. The commutator brushes, which are composed of strips of hard brass, joined together at their outer ends,...