Physics by Experiment: An Elementary Text-book for the Use of Schools

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Maynard & Company, 1891 - Physics - 320 pages

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Page 25 - The lever, the pulley, the wheel, and axle, the inclined plane, the wedge, and the screw.
Page 168 - ... which struck the water, that is to say the angle of reflection will be equal to the angle of incidence.
Page 61 - Gravitation all we know is, that it is a force of attraction operating between all the particles of matter in the exact measure which was ascertained by Newton, — that is — "directly as the mass, and inversely as the square of the distance.
Page 268 - The change in the number of lines of force passing through the coil...
Page 95 - This law states that the volume of a gas is inversely proportional to the pressure exerted upon it; therefore, as we ascend and the pressure outside the aircraft decreases, the air expands.
Page 193 - The disciples of Plato contributed not a little to the advancement of optics, by the important discovery they made, that light emits itself in straight lines, and that the angle of incidence is always equal to the angle of reflection. Plato terms colours " the effect of light transmitted from bodies, the small particles of which were adapted to the organ of sight" This seems precisely what sir Isaac Newton teaches in his " Optics,
Page 251 - ... atmospheric system flows in upon the centre in a spiral course. This rotatory peculiarity is common to all storms in the northern hemisphere that have yet been examined. In the southern hemisphere, a rotatory motion is also observed round the centre of storms, but it takes place in a contrary direction, or in the direction of the motion of the hands of a watch, instead of contrary to that direction, as obtains north of the equator. Professor Taylor has the merit of having first applied Dove's...
Page 282 - XVII. MAG-NETISM. 854. A MAGNET is a body which has the property of attracting iron and being attracted by it. 855. Magnetism is the science that treats of the laws, properties, and phenomena of magnets. Kinds of Magnets. 856. There are two kinds of magnets, Natural and Artificial. 857. NATURAL MAGNETS.—The natural magnet, or loadstone, is an ore of iron, found in great quantities...
Page 115 - It overcomes the attractive forces that tend to hold the molecules of a substance together, and thus changes it from a solid to a liquid or from a liquid to a gas, according to the state it was in when the heat was applied.
Page 242 - The strength of the current varies directly as the electromotive force and inversely as the resistance of the circuit, or — /= E/R, or R - Ell, or E = IR.

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