Lecture-notes on Physics..., Part 1

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From the Journal of the Franklin institute, 1868 - Matter - 115 pages
 

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Contents

I
3
II
11
III
28
IV
41
V
49
VI
94

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Page 2 - Who hath measured the waters in the hollow of his hand, and meted out heaven with the span, and comprehended the dust of the earth in a measure, and weighed the mountains in scales, and the hills in a balance?
Page 67 - 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 85 - 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 77 - Heat is a motion, expansive, restrained, and acting in its strife upon the smaller particles of bodies.
Page 85 - ... be considered a drop of water with the internal liquid removed and its place supplied by air. The spherical form in the two cases is produced by the operations of the same cause. The contractile force in the surface of the bubble is easily shown by blowing a large bubble on the end of a wide tube — say an inch in diameter ; as soon as the mouth is removed the bubble will be seen to diminish rapidly, and at the same time quite a forcible current of air will be blown through the tube against...
Page 8 - 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.
Page 79 - In short, whether we are considering the sources of extended exertion or of accumulated energy, whether we compare the accumulated forces themselves by their gradual or by their sudden effects, the idea of mechanic force in practice is always the same, and is proportional to the space through which any moving force is exerted or overcome, or to the square of the velocity of a body in which such force is accumulated.
Page 77 - Heat is a very brisk agitation of the insensible parts of the object, which produces in us that sensation from whence we denominate the object hot ; so what in our sensation is heat, in the object is nothing but motion.
Page 27 - Essay on the Velocity of Light," by M. Delaunay of the Institute of France; translated for the Smithsonian Institution by Prof. Alfred M. Mayer, 1864. Calculating Engines. The great importance of such machines in giving us faultless logarithmic, astronomical, nautical, and other tables. Impossible to calculate and print any extensive table without making errors. For a description of the Arithmetical Machine of Pascal, see Oevres de Pascal, vol. ii., page 368, et. seq.
Page 70 - This asserts that the total amount of energy in the universe, or in any limited system which does not receive energy from without, or part with it to external matter, is invariable.

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