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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1785 Excerpt: ...established natural relations subsisting between matter and motion, and the magnitudes of two powers, in equilibrio, are always inversely as their velocities. Keil's Physics, Lea. X. Hellham, Lect.VI. Emerson, Prop. 18, &c. Graves, L. I. C.X. Muschenbroek.Ch.VIlL Varignon, pag.joj. Maclaurin's Newton, B. II. Ch. Ill, Hamilton's Esijy on the Principles of Mechanics. Morgan's Notes to Rohault. toviobi. p2 LEVER. LEVER. 269. Def. A lever is a bar of wood or metal, and is usually represented by an inflexible line, without gravity, revolving about a fixed point, called the fulcrum, by the aSlion of a power upon its arms. Plate The points W, P, where the weight and power act, are the points of suspension, and the immoveable point F, about which LVIIT. every point of the lever revolves, is called promiscuously the fulcrum, hypo-mochlion, and center of motion. There are three kinds of levers: 1. the fulcrum is between the power and weight, as in the common balance, scissars, snuffers, &c. 2. The weight is between the power and centre of motion, as the oars and rudder of a boat, cutting knives fixed at one end, doors, &c. 3. The power is between the weight and fulcrum, as a ladder raised against a wall, a weight raised by the arm, where the center of motion is at the shoulder, &c. p 1 c 270. Cor. 1. Forces whose magnitudes are to each other as PAr Lix. pBf pCi &c actjng at p and terminated by a line AC, parallel to PF, have the fame effect: for each may be resolved into twa forces, one perpendicular, and the other parallel, to PF-, of which, the perpendicular parts are equal and entirely employed in producing a rotation of the lever round F, or in supporting a body W placed on the other side of F, and acting perpendicularly to FW, and the paralle...

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