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adhesion angle atmosphere atoms battery body bottle called capillarity cause centre of gravity cohesion coil colors conductor convex lens copper cylinder direction distance earth effect elastic electrical charge electrical current electrified electrode electroscope equal equilibrium escape ether-waves example exerted Experiment fall flow fluid force acts force of molecular gases glass greater heat inch increase instrument intensity kinds of matter length lens lenses lever light liquid luminiferous ether luminous machine magnetic melted mercury metals mirror molecular attraction molecules motion move Natural Philosophy needle object particles pass piece piston placed plane plate poles position pound pressure principal focus produced Questions for Review rays reflected refraction repulsion seen sensible heat shown in Fig solids sound sound-waves space specific gravity string substance surface temperature tion tube vapor velocity vessel vibrations visual angle voltaic voltaic cell waves weight wheel wire zinc
Page 66 - Every particle of matter, in the universe, attracts every other particle with a force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Page 63 - MECHANICAL POWERS are certain simple instruments employed in raising greater weights, or overcoming greater resistance than could be effected by the direct application of natural strength. They are usually accounted six in number; viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 173 - In the thermometer most generally used in the United States and England, and which is known as Fahrenheit's, the interval on the scale between the freezing and boiling points, is divided into 180 equal parts. This division is similarly continued below the freezing point to the place 0, called zero, and each division upward from that is marked with the successive numbers 1, 2, 3, etc. The freezing point will now be the 32d division, and the boiling point will be the 212th division.
Page 56 - Levers are divided into three classes: in the first class, the fulcrum ' is between the power and the weight ; in the second class, the fulcrum is...
Page 218 - ... that the sine of the angle of refraction bears a constant ratio to the sine of the angle of incidence.
Page 83 - ... Edison is alleged to have brought to a high degree of perfection in America. We are assured, too, at least by the newspapers, that he has succeeded in overcoming the difficulties to which I have just directed your attention. Instead of a platinum wire he is said to employ a strip of thin platinum foil, about one inch in length and a quarter of an inch in breadth ; and we are told that, when this strip of foil is raised to incandescence by the electric current, it yields a light equal to about...
Page 173 - In graduating a Centigrade thermometer, the freezing point is marked 0°, or zero, and the boiling point 100° ; the distance between the freezing and boiling points is divided into 100 equal parts; these equal divisions are carried as far below the freezing point and above the boiling point as desired.
Page 193 - 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.