A Treatise on MechanicsCarey & Lea, 1831 - 287 pagina's |
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acting angular velocity applied attached attraction axis balance beam body brass called cause centre of gravity centre of oscillation centrifugal force circumference continued cord curve cylinder descend diameter diminished DIONYSIUS LARDNER direction distance earth effect equal expansion explained expressed fall feet final velocity fixed friction fulcrum greater gridiron pendulum horizontal impulse inches inclined plane increased inertia iron length lever liquid load machine magnitude manner mass mechanical mercury moment of inertia move multiplied necessary observed ounces parallel particles passes perpendicular piece pinion placed point of suspension position pounds pressure principal axes principal axis principle produce proportion pulley quantity of motion radius of gyration rectilinear motion represented in fig resistance rest revolve rope round screw side space steel steelyard substance suppose surface suspended sustain teeth thread tion tube vibration weight wheel and axle wire YORK PUBLIC LIBRARY zinc
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Pagina 339 - In attempting this, the author has avoided as much as possible, "technicality;" and has given, if he does not flatter himself too much, to each disease of which he treats, its appropriate and designating characters, with a fidelity that will prevent any two being confounded together, with the best mode of treating them, that either his own experience or that of others has suggested.
Pagina 240 - ... have others much lighter. You will perceive that by means of these weights placed on different parts of the beam, I can learn the weight of any little mass from one grain or a little more to the yjW of a grain.
Pagina 269 - ... the distance from the point of suspension to the centre of oscillation must remain the same.
Pagina 240 - The weights I use are one globule of gold, which weighs one grain ; and two or three others which weigh one-tenth of a grain each ; and also a number of small rings of fine brass wire made in the manner first mentioned by Mr. Lewis, by appending a weight to the wire, and coiling it with the tension of that weight round a thicker brass wire in a close spiral, after which the extremity of the spiral being tied hard with waxed thread, I put the covered wire in a vice, and applying a sharp knife which...
Pagina 151 - B, it acts obliquely upon it, and, as it moves, the coiner of B slides upon the plane surface of A in such a manner as to produce much friction, and to grind away the side of A and the end of B. As they approach the position CD, they sustain a jolt the moment their surfaces come into full contact ; and after passing the position...
Pagina 188 - When the level of the water rises, the buoyancy of the ball causes it to rise also with a force equal to the difference between its own weight and the weight of as much water as it displaces.
Pagina 37 - ... the one, is engaged in giving a double velocity to the other. If a cannon-ball were forty times the weight of a musketball, but the musket-ball moved with forty times the velocity of the cannon-ball, both would strike any obstacle with the same force, and would overcome the same resistance ; for the one would acquire from its velocity as much force as the other derives from its weight. A very small velocity may be accompanied by enormous force, if the mass which is moved with that velocity be...
Pagina 162 - By means of the fixed pulley a man may raise himself to a considerable height, or descend to any proposed depth. If he be placed in a chair or bucket attached to one end of a rope, which is carried over a fixed pulley, by laying hold of this, rope on the other side, as represented in Jig.
Pagina 27 - If a passenger leap from a carriage in rapid motion, he will fall in the direction in which the carriage is moving at the moment his feet meet the ground ; because his body, on quitting the vehicle, retains, by its inertia, the motion which it had in common with it. When he reaches the ground, this motion is destroyed by the resistance of the ground to the feet, but is retained in the upper and heavier part of the body ; so that the same effect is produced as if the feet had been tripped.
Pagina 242 - ... delicacy of touch, which is desirable in such operations. — Kater. Why does one weight alone serve to determine a great variety of others, by the steelyard ? Because the steelyard is a lever, having unequal arms, and by sliding the weight along the longer arm of the lever, we thus vary its distance from the fulcrum, taken in a reverse order ; consequently, when a constant weight is used, and an equilibrium established, by sliding this weight on the longer arm of the lever, the relative weight...