The Principles of Mechanics ...: To which is Now Added, an Appendix; Containing Explanatory Notes, Illustrations, and Observations. A New Edition, with Important Corrections ...

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Knight and Lacey at the James Watt, 1825 - 318 pàgines
 

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Pàgina xxv - And he made in Jerusalem engines, invented by cunning men, to be on the towers and upon the bulwarks, to shoot arrows and great stones withal.
Pàgina 143 - ... provided the elbow of one of the handles be at right angles to that of the other. And with a fly, or heavy wheel, applied to it, a man may do...
Pàgina 133 - To shew that the resultant thrust on any plane surface under fluid pressure is equal to the weight of a column of the fluid whose base is the area of the surface and whose height is the depth of the centre of gravity of the surface.
Pàgina xvii - Being preceded and led by- a boy, hired for that purpose, he crawled in slow and solemn state, at the rate of a mile and a half in an hour, till in due time he arrived at Darlington, and was conducted, in the same state, to the great entertainment of the spectators, through the streets to the inn where he wished to refresh himself and his beast. What idea Emerson himself entertained of the velocity with which the animal could move, appears from this, that when a neighbour of his, from Hurworth, asked...
Pàgina 112 - ... in a few hours. Now, the weight of a column of air of the height of the atmosphere is equal to that of a column of mercury twenty-eight inches high, or of a column of water of the height of about thirty-three feet.
Pàgina 1 - Force is a power exerted on a body to move it. If it act but for a moment, it is called the force of percussion or impulse. If it act constantly, it is called an accelerative force.
Pàgina 52 - If a line be drawn from the centre of gravity of a body perpendicular to the horizon, it is called the line of direction, because it is the line that the centre of gravity would describe if the body fell freely.
Pàgina 46 - For since the time of vibration is to the time of descent through half the length of the pendulum, as the circumference of a circle to its diameter, that is, as 3.14159 to 1?
Pàgina 16 - The motions of bodies included in a given space are the same among themselves, whether that space is at rest, or moves uniformly forward in a right line without any circular motion.
Pàgina 101 - ... the great limbs is stronger than that of the small ones, and the wood in the heart of a sound tree is strongest of all. I have also found by experience, that a piece of timber, which has borne a great weight for a small time, has broke with a far less weight, when left upon it for a far longer time.

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