First Lessons in PhysicsG.I. Jones and Company, 1880 - 174 sivua |
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adhesion aqueous vapor atmosphere attraction barometer Burning-glass called causes closed clouds cold colors column of water common pump compressed condensed conductors convex lens cool cork cylinder descends direction downward drop ductile earth elastic electric current electrified electro-magnet engine expansive force EXPERIMENT EXPERIMENT.-If fall filled with water flame float on water force of gravity freezing-point Give glass tube greater hand heated air hence hole immersed inches inclined plane India-rubber iron LESSON lever liquid long arm looking-glass lower valve magnet mercury mercury rises metallic motion move nail Newcomen's objects paper particles pass pencil pendulum piece piston pith balls poles pound pressure of air prism rays of light reflect light rise seen sensible heat Show sink solid space specific gravity steam steam-engine stone string substance surface suspended thermometer tion tricity tumbler vacuum velocity vessel vibrations weight white light wire zinc
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Sivu 106 - It can engrave a seal, and crush masses of obdurate metal like wax before it — draw out, without breaking, a thread as fine as gossamer, and lift a ship of war like a bauble in the air. It can embroider muslin, and forge anchors, cut steel into ribands, and impel loaded vessels against the fury of the winds and waves.
Sivu 106 - ... is as nothing to it. It can engrave a seal, and crush masses of obdurate metal before it ; draw out, without breaking, a thread as fine as gossamer, and lift a ship of war like a bauble in the air. It can embroider muslin and forge anchors, cut steel into ribbons, and impel loaded vessels against the fury of the winds and waves.
Sivu vi - Physics lies at the foundation of all science; and if nothing else were taught, it would be a great gain to have the youth of this country soundly instructed in the laws of the elementary forces — gravitation, heat, light, and so forth. The purely physical sciences furthermore have the great practical advantage that they can be pursued to a great extent without what have been felicitously termed "stinks or messes...
Sivu 38 - Divisions of Matter. — Three divisions of matter are recognized in science : masses, molecules, and atoms. A Mass of matter is any portion of matter appreciable by the senses. A Molecule is the smallest particle of matter into which a body can be divided without losing its identity.
Sivu 100 - The bulb is therefore heated, when the air within expands, and a portion escapes in bubbles through the mercury. On cooling, the pressure of the external atmosphere forces a quantity of mercury through the tube into the bulb. By repeating this operation a few times, the bulb and a portion of the tube are filled with mercury. The whole is then heated till the mercury boils, thus filling the tube, when the funnel is melted off and the tube hermetically sealed by means of a jet of flame urged by a blow-pipe.
Sivu 173 - Fig. 22. straight through the cork, so that it may be truly central. Of the proper direction the eye will be the best judge : and when the cork-borer has penetrated some little way, it will be advisable to turn the cork a quarter round, in order that it may be seen whether the axis of the cork-borer and of the cork are still in the same straight line. If not, a slight pressure on the cork-borer in one direction or the other, while the boring is continued, will set it straight.
Sivu 18 - Bring the north pole of a magnet near the north pole of a freely suspended magnet; this north pole will be repelled. Now, if the two south poles are brought together, they also repel each other; but when the north pole of the one is near the south pole of the other, there will be mutual attraction between these unlike poles. Like poles repel, unlike poles attract each other.
Sivu 34 - Moreover, since particles of water still cling to the rod, it is obvious that the adhesive force between the glass and the water is greater than the cohesive force of the water.
Sivu 94 - Why are steam-chests and steam-cylinders often covered with wood ? 5. Why are the walls of safes often filled with fine ashes ? 6.
Sivu 36 - F. to several degrees below zero. The Flashing Point. The flashing point of petroleum varies from zero in some Italian oils to 338° F. in some African oils. The fuel value of the oil from the eastern Indiana field is 18,900 BTU Specific Gravity.