The Elements of Natural Philosophy

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Van Antwerp, Bragg & Company, 1870 - Physics - 468 pages
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Page 54 - Every body continues in a state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by a force impressed upon it.
Page 191 - The mercury is sustained in the tube by the pressure of the atmosphere on the surface of the fluid in the cup.
Page 77 - These machines are ; 1. the lever; 2. the wheel and axle ; 3. the pulley ; 4. the inclined plane ; 5. the wedge ; and 6. the screw.
Page 475 - WILLIAMS'S PARSER'S MANUAL The Parser's Manual, embracing classified examples in nearly every variety of English construction. By JOHN WILLIAMS, AM i2mo., cloth, 264 pp. OBJECT LESSONS AND COMPOSITION. Things Taught : Systematic Instruction in Composition and Object Lessons. By Dr. ME LILIENTHAL and ROBT. ALLYN, MA Prepared by order of the Cincinnati School Board. i6mo., 96 pp. LANGUAGE EXERCISES. For Primary Classses. By J. MICKLEBOROUGH, Prin. Cincinnati Normal School, and CC LONG, Prin. 2oth District...
Page 260 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
Page 78 - An equilibrium is produced in all the levers, when the weight multiplied by its distance from the fulcrum is equal to the product of the power multiplied by its distance from the fulcrum.
Page 479 - A compact volume, comprehensive in scope, but sufficiently brief to be completed in one school term. Its statements of historical facts are based upon the studies of the most recent and reliable authorities. The maps are superior in fullness, accuracy, and beauty. Barnes's Brief History of France.
Page 173 - I have many reasons to believe, though all those who have thought about it are of a different opinion,) it will follow that the weight and pressure of the air are the sole cause of this suspension, and not the horror of a vacuum : since it is very certain that there is more air to weigh on it at the bottom than at the top ; while we cannot say that nature abhors a vacuum at the foot of a mountain more than. on its summit.
Page 421 - ... proportion of one thousand Ibs. by weight of water to one hundred Ibs. of hydrochlorate of ammonia. A plate of sheet iron, nearly as long and as deep as the trough, is attached to the positive pole of the battery and immersed in the solution. Another plate of sheet iron, about half the size of the other, is attached to the negative pole of the battery, and immersed in the solution, and when the solution has arrived at the proper condition, which will require several days, the plate of iron attached...
Page 124 - R. This wheel being acted on by the weight tends to move continuously, let us say in the direction indicated by the arrowhead. Now, if the pendulum is at rest, the wheel is held at rest by the pallet, m, and with it the whole of the clockwork and the weight.

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