A Course of Lectures on Natural Philosophy and the Mechanical Arts, Հատոր 2Taylor and Walton, 1845 - 608 էջ |
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A course of lectures on natural philosophy and the mechanical arts, Հատոր 2 Thomas Young Ամբողջությամբ դիտվող - 1845 |
A Course of Lectures on Natural Philosophy and the Mechanical Arts: Plates Thomas Young Ամբողջությամբ դիտվող - 1845 |
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A B C angle apparent magnitude axis ball beam cut centre of gravity centre of inertia circle cochlea colours concave convex lens cubic parabola curve cycloid cylinder descending DESCRIPTION OF PLATES direction distance drawn earth ecliptic elevation ellipsis equal equilibrium fixed fluid force glass Gower Street 1845 impelled inclined plane Insula joint Joseph Skelton sculp length lever light line A B London Taylor means mirror moon motion moveable moving nearly Newtonian telescope oblique organ pipe pallet parallel passing path perpendicular piston plane portion pressure prism pulley pump rays refracted represented revolving rope round scale scapement screw slider spirit level spring stopcock strongest form supporting a weight supposed surface Taylor & Walton telescope tooth tube turned Upper Gower Street valve velocity vessel vibrations Walton Upper Gower wire
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Էջ xxxi - Z>, on the painted slider at E, and the magnifier F forms the image on the screen at G. This lens is fixed to a slider, which may be drawn out of the general support or box H, and when the box is drawn back on its wheels, the rod IK lowers the point K, and by means of the rod KL adjusts the slider in such a manner, that the image is always distinctly painted on the screen G. When the box advances towards the screen, in order that the images may be diminished and appear to vanish, the support of the...
Էջ viii - He then gives the illustration (Fig. 7), shown on the preceding page, of "a wheel supposed to be capable of producing a perpetual motion; the descending balls acting at a greater distance from the center, but being fewer in number than the ascending. In the model, the balls may be kept in their places by a plate of glass covering the wheel.
Էջ xxxi - This lens is fixed to a slider, which may be drawn out of the general support or box H, and when the box is drawn back on its wheels, the rod IK lowers the point K, and by means of the rod KL adjusts the slider in such a manner, that the image is always distinctly painted on the screen G. When the box advances towards the screen, in order that the images may be diminished and appear to vanish, the support of the lens F suffers the screen M to fall, and intercept a part of the light. The rod KN must...
Էջ xviii - Because the greater pressure of the tooth on the edge of the cylinder The second diagram represents Mr. Arnold's watch escapement. The pin, A, projecting from the verge or axis of the balance, moving towards B, carries before it the spring, B, and with it the stiffer spring, C, so as to set at liberty the tooth, D, which rests on a pallet projecting from the spring. The angle, E, of the principal pallet has then just passed the tooth, F, and is impelled by it until the tooth, G, arrives at the detent....
Էջ iii - A body acted on by gravity descends in a straight line : find the space described in a given time, and prove that it is equal to half the space which would be described in the same time with the last acquired velocity continued uniform.
Էջ vii - ... will diminish, but the power will increase in an equal ratio. This will, however, be better understood by reference to another figure. In this diagram two weights are placed in equilibrio, by means of the arrangement already described. The distance of the threads of the interior screw is four-fifths of that of the exterior or perforated screw, and this distance is one-thirtieth •Bof the circumference.
Էջ xxii - Fig. 267. Two equal series of waves, diverging from the centres A and B, and crossing each other in such a manner that, in the lines tending towards C, D, E, and F, they counteract each other's effects, and the water remains nearly smooth, while in the intermediate spaces it is agitated. the first to be described to the student of optics.
Էջ xxiii - ... fluids as well as between the fluids and their containing tubes. Let us see then how, in this figure, a stream of water carried through a cistern of water will, by its friction, draw after it the water in the cistern, and carry it above its natural level, and over the side of the vessel. Fig. 2, The stream entering the reservoir, A, by the pipe, B, carries with it all the water, C, which stands above the level of its upper surface. By this we see that the stream of blood entering into the heart,...
Էջ iii - ... represented by any portion AB of the base of a triangle, the velocity will be proportional to BC, which is equal to AB, and the space described during the time DE, supposed infinitely short, will be proportional to the area DEFG, which is expressed by the product of BC and DE ; consequently the whole area AEF will represent the space described in the time AE, and AHI the space described in the time AH ; but AHI is half of the square HK, and AEF of EL : the space is therefore always as the square...
Էջ xxii - C, loaded with a movable weight D; the shadow of the waves being thrown on a screen E by the lamp F, through the bottom of the trough, which is of glass. Fig. 266. A series of waves, diverging from the centre A, and passing through the aperture BC, extend themselves on each side so as to fill the space BCDE, while they affect the parts without this space much less sensibly. Fig. 267. Two equal series of waves, diverging from the centres A and B, and crossing each other in such a manner that, in the...