Introductory Course of Natural Philosophy for the Use of Schools and AcademiesA.S. Barnes & Company, 1871 - 504 pages |
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Page 184
... , the rod A expands , and the expansion is shown by the B A Fig 127 motion of the index , D. When the rod ,. How is the linear expansion of metals shown ? How are rays from the focus reflected ? Explain the. 184 POPULAR PHYSICS .
... , the rod A expands , and the expansion is shown by the B A Fig 127 motion of the index , D. When the rod ,. How is the linear expansion of metals shown ? How are rays from the focus reflected ? Explain the. 184 POPULAR PHYSICS .
Page 200
... focus of the mirror . Conversely , if the rays proceed from the focus they will be reflected in lines parallel to the axis . A and B , Fig . 138 , represent two parabolic reflectors , having their axes coincident , and their surface ...
... focus of the mirror . Conversely , if the rays proceed from the focus they will be reflected in lines parallel to the axis . A and B , Fig . 138 , represent two parabolic reflectors , having their axes coincident , and their surface ...
Page 201
... focus , where they produce heat enough to set inflammable substances on fire . It is said that ARCHIMEDES was enabled by means of mirrors to set fire to the Roman ships in the harbor of. How are rays from the focus reflected ? Explain ...
... focus , where they produce heat enough to set inflammable substances on fire . It is said that ARCHIMEDES was enabled by means of mirrors to set fire to the Roman ships in the harbor of. How are rays from the focus reflected ? Explain ...
Page 203
... focus at F , but by interposing a square plate of some sub- stance between the mirror and its focus , the rays are again . reflected , and come to a focus as far in front of the plate , as F is behind it . The heat thus reflected is ...
... focus at F , but by interposing a square plate of some sub- stance between the mirror and its focus , the rays are again . reflected , and come to a focus as far in front of the plate , as F is behind it . The heat thus reflected is ...
Page 272
... an object , as shown in Fig . 160 , each point will DIWARDI Fig . 160 . have its own image as far behind the mirror as. Explain the manner of forming the image of an object . ( 278. ) What is a Focus ? The Principal. 272 POPULAR PHYSICS .
... an object , as shown in Fig . 160 , each point will DIWARDI Fig . 160 . have its own image as far behind the mirror as. Explain the manner of forming the image of an object . ( 278. ) What is a Focus ? The Principal. 272 POPULAR PHYSICS .
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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...