Physics by Experiment: An Elementary Text-book for the Use of SchoolsMaynard & Company, 1894 - 320 páginas |
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Términos y frases comunes
angle apparatus armature attraction ball bar magnet battery body boiling bottle called candle cell centre of gravity chimney circuit coil colors conductor convex lens cork current of electricity cylinder direction disk distance draw earth electrified electrophorus Experiment Fasten feet flame flask frictional electricity fulcrum galvanometer glass tubing heat helix hole 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 glass piece of wood plane plate position pounds pressure produced pulley rarefaction 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 wire zinc
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Página 86 - The resistance which is opposed to a pump rod in raising water, is ~equal to the weight of a column of water whose base is the area of the piston, and...
Página 182 - ... which struck the water, that is to say the angle of reflection will be equal to the angle of incidence.
Página 279 - ... force are decreasing. In reality, currents produced in a conductor cutting lines of force and currents induced in a coiled conductor by a change in the number of lines of force that pass through the coil are due to the same motion, for every conductor carrying a current of electricity forms a closed coil, and every line of force is a complete magnetic circuit by itself. Consequently, when any part of a closed coil is cutting lines of force, the lines of force are passing through the coil in a...
Página 155 - ... range of four octaves, but also in the special quality of tone which is peculiar to each class of voice, and which may be referred to the corresponding structure of the larynx. The difference in the pitch of tones is due in the first place to the number of vibrations performed by the vocal chords in a given time ; the greater the number of vibrations, the higher is the tone produced. While E is produced by 80 vibrations in the second, 1024 vibrations are required in the same period to give c'".
Página 207 - 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 263 - ... 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 73 - Law of gravitation: Every particle of matter in the universe attracts every other particle...
Página 254 - 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.
Página 92 - The specific gravity, or specific weight of a body, is its weight as compared with the weight of an equal bulk of some other substance^ assumed as the standard of comparison.
Página 202 - Compound Microscope. — The compound microscope consists of two or more convex lenses mounted in a tube, which is blackened inside.