Physics by Experiment: An Elementary Text-book for the Use of SchoolsMaynard & Company, 1891 - 320 páginas |
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Términos y frases comunes
acid angle apparatus armature attraction ball bar magnet battery body boiling bottle called candle cardboard cell centre of gravity chimney circuit coil colors conductor convex lens cork current of electricity cylinder direction disk distance draw earth edge electrified Experiment fall Fasten feet flame flask frictional electricity fulcrum galvanometer glass tubing heat helix hole inches in diameter inches long internal resistance iron filings knitting needle lens lever Leyden jar lines of force liquid magnetic needle mercury mirror molecules motion move north pole notice number of lines ohms paper pass pendulum piece of wood plane plate position pounds pressure produced pulley rays of light reflected refracted screen screw sealing-wax shown in Fig side sound waves south pole specific gravity square stone string strip substance sulphuric acid surface temperature thermometer thread tion tumbler velocity vibrations volts weight zinc
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Página 25 - The lever, the pulley, the wheel, and axle, the inclined plane, the wedge, and the screw.
Página 170 - ... which struck the water, that is to say the angle of reflection will be equal to the angle of incidence.
Página 63 - 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.
Página 270 - The change in the number of lines of force passing through the coil...
Página 96 - 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.
Página 195 - 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,
Página 253 - ... 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...
Página 284 - 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...
Página 117 - 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.
Página 244 - 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.