Introductory Course of Natural Philosophy for the Use of Schools and AcademiesA.S. Barnes & Company, 1871 - 504 pages |
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Page 33
... figure , and the whole assumes the appearance of a flat- tened sphere . Machines . Fig . 14 . 29. A MACHINE is any contrivance by means of which a force acting at one point is made to produce an effect at some other point . Effect on ...
... figure , and the whole assumes the appearance of a flat- tened sphere . Machines . Fig . 14 . 29. A MACHINE is any contrivance by means of which a force acting at one point is made to produce an effect at some other point . Effect on ...
Page 35
... figures in this article , CB is the lever arm of the power , and CA the lever arm of the resistance . Conditions of Equilibrium of the Lever . 31. It is demonstrated in Mechanics ( Art . 78 ) , that the effect of a force produced by the ...
... figures in this article , CB is the lever arm of the power , and CA the lever arm of the resistance . Conditions of Equilibrium of the Lever . 31. It is demonstrated in Mechanics ( Art . 78 ) , that the effect of a force produced by the ...
Page 44
... figure , g is the centre of gravity , and that point must be kept exactly over the point of support . This is a case of unstable equilibrium . If a body has but two points of support , it can L. DUJARDIN .. Fig . 23 . Where is the ...
... figure , g is the centre of gravity , and that point must be kept exactly over the point of support . This is a case of unstable equilibrium . If a body has but two points of support , it can L. DUJARDIN .. Fig . 23 . Where is the ...
Page 47
... figures are hollow and light , and are ballasted with lead at their lower part so as to throw the centre of gravity ... figure settles in its prim- itive state of rest only after several oscillations , which are due to the inertia of ...
... figures are hollow and light , and are ballasted with lead at their lower part so as to throw the centre of gravity ... figure settles in its prim- itive state of rest only after several oscillations , which are due to the inertia of ...
Page 76
... figure . Water is supplied from a cis- tern through the funnel D. When the water is admitted , it flows down the tube C , and escap- ing through the curved tubes at the bottom , the wheel is turned in the direction indicated by the ...
... figure . Water is supplied from a cis- tern through the funnel D. When the water is admitted , it flows down the tube C , and escap- ing through the curved tubes at the bottom , the wheel is turned in the direction indicated by the ...
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Common terms and phrases
absorb acid action acts angle angle of incidence apparatus applied atmosphere attraction axis ball barometer battery body called camera obscura carbonic acid catgut causes centrifugal force colors compressed concave concave lenses condensed conductor consists convex convex lens copper cord cylinder density Describe direction distance earth effect elastic electricity electrified electrometer equal equilibrium example expansion experiment Explain flow fluid force galvanometer gases glass heat Hence hygrometer Illustrate inch incidence inclined plane instrument iron latent heat lens lenses lever Leyden jar light liquid machine magnet Manometer mercury metals mirror motion needle object particles passes pendulum pipe piston placed plane plate poles position pressure principal focus principle pulley quantity radiation rays reflected reflector refraction resistance shown in Fig solid sound specific gravity steam surface telescope temperature tension thermometer tion transmitted tricity tube valve vapor velocity vessel vibrations weight wheel whilst wire zinc
Popular passages
Page 150 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Page 40 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Page 219 - The heat which is expended in changing a body from the solid to the liquid state, or from the liquid to the gaseous state, is called latent heat.
Page 13 - It is evident that a body can not exist without possessing the three attributes of length, breadth, and thickness. The FORM of a body is its external shape. Bodies may have the same magnitude and be very different in shape ; they may likewise be of the. same form and yet be of very different magnitudes. Impenetrability. 7. IMPENETRABILITY is that property by virtue of which no two bodies can occupy the same place at the same time.
Page 14 - INERTIA is the tendency which a body has to maintain its state of rest or motion. If a body is at rest it has no power to set itself in motion, or if it is in motion it has no power to change either its rate of motion or the direction in which it is moving. Hence, if a body is at rest, it will remain at rest, or if in motion, it will move on uniformly in a straight line until acted upon by some force. The reason why we do not see bodies continue to move on uniformly in straight lines, when set in...
Page 188 - By repeating this operation a few times, the bulb and a portion of the tube are filled with mercury. The whole is then heated till the mercury boils, thus filling the tube, when the funnel is melted off and the tube hermetically sealed by means of a jet of flame urged by a blow-pipe. On cooling, the mercury descends to some point of the tube, as shown in O.ffe.
Page 275 - The following definitions apply equally to concave and convex mirrors : The middle point of the mirror is called its vertex. The centre of the sphere, of which the mirror forms a part, is called the optical centre.
Page 149 - But a caution as to the necessity in all specific gravity experiments of getting rid of air-bubbles may not be out of place. To attain this end boiled water should be used, and if mechanical contrivances fail (a feather or sable pencil) then the liquid and stone should be placed under the receiver of an airpump and the air exhausted. Details concerning the specific gravity of each kind of precious stone will be found in chapter vi.
Page 43 - The weight of a body is due to the force of gravity, acting upon all of its particles, but it must not be confounded with the force of gravity. Weight is only the effect of gravity when resisted ; when gravity is unresisted it produces quite another effect, that is, motion. At the same place the weights of bodies are proportional to their masses, or the quantities of...