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acid angle aqueous humor atoms attraction axle ball battery becomes body causes centre of gravity centrifugal force chemical cohesion colors condensed conductor convex convex lens cool copper cord crystalline lens Describe distance drop earth elastic electricity equal experiments fall feet filled float force friction galvanic gases glass tube gutta-percha heat heat-rays illustrations inches inclined plane insulated iron law of equilibrium length lens lever Leyden jar lift liquid machine magnet matter mercury metal miles mirror molecules motion move needle negative object particles pass pendulum piston plate polarized pole pressure prime conductor principle produced pulley rays of light reflected refracted revolve rise shown in Fig solid sound sound-wave specific gravity square steam stone strike string substance surface temperature theory tricity vacuum vapor velocity velocity of sound vessel vibrations waves weight wheel wind wire zinc
Page 23 - Hebrews was the length of the forearm from the elbow to the end of the middle finger; and the smaller scriptural dimensions are expressed in hand-breadths and spans.
Page 254 - To matter or to force The All is not confined ; Beside the law of things Is set the law of mind ; One speaks in rock and star, And one within the brain, In unison at times, And then apart again ; And both in one have brought us hither That we may know our whence and whither.
Page 117 - Archimedes' principle, that a body immersed in water is buoyed up by a force equal to the weight of the water displaced by the body.
Page 181 - Smyth informed us in his interesting discourse, that we dig annually 84 millions of tons of coal from our pits. The amount of mechanical force represented by this quantity of coal seems perfectly fabulous. The combustion of a single pound of coal, supposing it to take place in a minute, would be equivalent to the work of 300 horses ; and if we suppose...
Page 121 - Scientific education ought to teach us to see the invisible as well as the visible in nature ; to picture with the eye of the mind those operations which entirely elude the eye of the body ; to look at the very atoms of matter in motion and at rest, and to follow them forth, without ever once losing sight of them, into the world of the senses, and see them there integrating themselves in natural phenomena.
Page 145 - In general, the velocity depends on the relation between the density and the elasticity of the medium ; and the intensity is proportional to the square of the amplitude of the vibrations.
Page 207 - It would be difficult to describe the surprise and astonishment expressed in the countenances of the bystanders on seeing so large a quantity of water heated, and actually made to boil, without any fire.
Page 184 - G rise. Why not billions ? The heat at first will be only so much the greater. But, lo ! about the stage of four hundred billions there is more — a dim red light becomes visible in the gloom ; and now, while the rate still mounts up, the heat in its turn dies away, till it vanishes as the sound vanished ; but the red light will have passed for the eye into a yellow, a green, a blue, and, last of all, a violet. And to the violet, the revolutions being now about eight hundred billions a second, there...