Physics by Experiment: An Elementary Text-book for the Use of SchoolsMaynard, Merrill & Company, 1901 - 328 páginas |
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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 Crookes tube current of electricity cylinder direction disk distance draw earth Experiment Fasten feet flame flask frictional electricity fulcrum galvanometer glass tube 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 zinc
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Página 190 - ... which struck the water, that is to say the angle of reflection will be equal to the angle of incidence.
Página 73 - 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 188 - P*, so that they shall be in a straight line with the image of the first pin set up. Now remove the mirror, and draw lines through the points where the pins stick, producing these lines till they meet behind the mirror. Measure the distance the image...
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 273 - Fio. 837. • the copper wire, and the arrow indicates the direction of the current. When the current flows along the wire from A to B, the direction of the lines of force was right-handed, or in the direction of the motion of the hands of a clock, as shown by the curved arrow ; when the current flowed from B to A, the direction of the lines of force was lefthanded, or counter clock-wise. Or, to state it differently, if a person looks along a conductor in the direction in north-seeking, pole of a...
Página 163 - ... 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 26 - Fio. 26. pounds at a distance of 3 feet from one end. Find the pressure on each point of support. 9. What kind of a lever is shown in the steelyard (Fig.
Página 155 - Experiment 117. — Obtain a strip of wood eight or ten feet long and about half an inch thick ; place a watch upon the end of this strip, and see whether its ticking can be heard at the other end. Or place a watch on one end of a table or bench, and see whether its ticking can be heard when the ear is placed at the other end.
Página 210 - The eye is . 178. LIGHT. The image is virtual and erect. In Fig. 178 AB is the object, and CD the image. Compound Microscope. — The compound microscope consists of two or more convex lenses mounted in a tube, which is blackened inside. One of the lenses is of short focus and is called the objective / the other lens is of longer focal length and is called the eye-piece. The object AB (Fig. 179) is placed just beyond the focus of the objective O. A real inverted image CD is formed within the tube....