A Manual of Natural Philosophy: Compiled from Various Sources and Designed for Use as a Text-book in High Schools and AcademiesCharles Desilver, 1858 - 379 pàgines |
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A Manual of Natural Philosophy: Compiled from Various Sources, and Designed ... John Johnston Visualització completa - 1846 |
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air-pump angle aperture apparent magnitude appear atmosphere attraction axis ball becomes bottom called centre of gravity colors concave concave lens convex convex lens cord course crystalline lens cylinder diameter direction discharge distance double-convex lens earth effect elasticity electricity equal excited experiment eye-glass fall feet figure fluid focus force friction glass inches inclined plane instrument interlinear inverted iron kind length lever Leyden jar liquid magnet manner means mercury metallic mirror motion move needle north pole object observed particles pass pendulum perpendicular person piece piston plane plate polarized portion position pounds pressure prime conductor prism produced pulley quantity QUESTION ray of light reflected refracted retina rise screw sealing-wax seen shown side solid sound south pole specific gravity spectrum substance supposed surface suspended telescope tion tube upper usually valve velocity vessel vibrations Virginia Military Institute weight wheel wire
Passatges populars
Pàgina 65 - Mechanical Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Pàgina 72 - There is an equilibrium upon the wheel and axle when the power is to the weight as the radius of the axle to the radius of the wheel.
Pàgina 31 - I shall just offer a few illustrations of the CENTRE OF GRAVITY. The centre of gravity of a body is that point about which all its parts...
Pàgina 102 - It seems to me that law cannot be the cause of phenomena, but is an effect produced in our minds by their succession and resemblance. To put a God back of the universe, compels us to admit that there was a time when nothing existed except this God ; that this God had lived from eternity in an...
Pàgina 142 - From this voyage we learn also that the pressure of the atmosphere at the level of the sea is not the same in every part of the globe. Barometrical observations show that this pressure increases gradually from the equator to about the 30th parallel, from which it as gradually sinks up to the pole, and falls below the mean of the equator : generally stated, we may say that, south of Cape...
Pàgina 113 - Then fill it with the liquid under examination, and again weigh it ; and divide the weight of the latter liquid by the weight of the water, and the quotient will be the specific gravity of the liquid as required.