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air-pump angle angles of incidence aphelion apparatus appear ascertained atmosphere attraction axis axle ball battery called causes centre of gravity Ceres circle color comet communicated concave mirror condensing conductor constructed convex lens copper cylinder degree diameter direction distance earth eclipse effect elasticity Electro-Magnetism equal experiment Explain Fig Explain the figure fall focus force friction galvanic glass heat heavenly bodies hydrostatic hygrometer illustration inclined plane Jupiter kinds lenses lever Leyden jar liquid luminous body magnet mercury metallic moon motion move object orbit particles pass perihelion perpendicular piston placed planet plate pole pressure prime conductor principle produced properties proportion pulley pump quantity rays of light reflected reflecting telescope refraction represents retina revolve rise Saturn screw seen side solar specific gravity stars steam steam-engine substances surface telescope tion tricity tube Uranus valve velocity vessel voltaic voltaic pile weight wheel wire zinc
Sivu 194 - High-gleaming from afar. Prime cheerer Light ! Of all material beings first, and best ! Efflux divine! Nature's resplendent robe! Without whose vesting beauty all were wrapt In unessential gloom; and thou, O Sun!
Sivu 53 - ... wheel is allowed to pass. Now, if this wheel has sixty teeth, as is common, it will just turn round once for sixty beats of the pendulum, or seconds; and a hand fixed on its axis, projecting through the dial-plate, will be the second hand of the clock.
Sivu 63 - ... time that the axle describes a small one, therefore the power is increased in the same proportion as the circumference of the wheel is greater than that of the axle. If the velocity of the wheel is...
Sivu 148 - H, extending outside of the boiler, and which is managed by the engineer. The operation of the machine is as follows : The steam being generated in great abundance, in the boiler, and being unable to escape out of it, acquires a considerable degree of elastic force. If, at that moment, the cock, V...
Sivu 146 - The trunk of an elephant that can pick up a pin or rend an oak is as nothing to it. 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 146 - By his admirable contrivance, it has become a thing stupendous alike for its force and its flexibility, — for the prodigious power which it can exert, and the ease, and precision, and ductility, with which that power can be varied, distributed, and applied.
Sivu 280 - By these eclipses also, it has been ascertained that light is about eight minutes in coming from the sun to the earth. For, an eclipse of one of these satellites appears to us to take place sixteen minutes sooner, when the earth is in that part of its orbit nearest Jupiter, than when in the part farthest from that planet.
Sivu 188 - The spectrum, formed by a glass prism, being divided into 360 parts, it is found that the red occupies 45 of those parts, the orange 27, the yellow 48, the green 60, the blue 60, the indigo 40, and the violet 80...