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ampere angle angle of incidence atmosphere atoms attraction body boiling called carbon cause cell centimetre centre of gravity charge circuit coil colors condensed conductor convex lens copper cubic cubic centimetre cylinder density direction distance earth electric electric charge electroscope energy equal ether ether waves exerted Experiment fall feet flow foot-pounds friction galvanometer gases glass grams greater heat inch increase iron lamp length lens light liquid luminous machine magnet mass matter melted mercury metal millimetre mirror molecules motion move needle object ohms opposite parallel particles pass pendulum piece piston placed plane plate pole position pounds pounds weight pressure principal focus produced quantity rays reflected refraction resistance shown in Fig solids sound sound-waves specific gravity square steam string substance surface temperature tion tube vapor velocity vertical vessel vibrations volume waves weight wheel wire zinc
Page 89 - These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Page 201 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 8 - Kelvin has shown that if a drop of water were magnified to the size of the earth the molecules of water would be of a size intermediate between that of a cricket ball and of a marble.
Page 131 - The weight of the atmosphere sustains the mercury at the height of about 29^ inches ; but the exact height depends upon the weight of the atmosphere, which varies much according to the state of the weather. The greater the pressure of the air on the mercury in the cup, the higher it will ascend in the tube. The air...
Page 236 - BOILED ! It would be difficult to describe the surprise and astonishment expressed in the countenances of the bystanders, on seeing so large a quantity of cold water heated, and actually made to boil, without any fire.
Page 181 - It is with illumination that the familiar " inverse square" and "cosine" laws for light are usually associated. Briefly stated, these are ( 1) the intensity of illumination due to a point source of light varies inversely as the square of the distance from the source...
Page 106 - ... of liquid .whose base is that of the vessel and whose height is the depth of the liquid.
Page 302 - The force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
Page 128 - One of the main factors in the combustion of coal is the proper supply of air. Air is composed of two gases, oxygen and nitrogen, in the proportion, by volume, of 21 per cent of oxygen and 79 per cent of nitrogen, or by weight, 23 per cent of oxygen and 77 per cent of nitrogen. The composition of pure dry air is as follows: By volume, 20.91 parts O.