The principles of mechanics : explaining and demonstrating the general laws of motion, the laws of gravity, motion of descending bodies, projectiles, mechanic powers, pendulums, centers of gravity, &cstrength and stress of timber, hydrostatics, and construction of machines : a work very necessary to be known, by all gentlemen, and others, that desire to have an insight into the works of nature and art : and extremely useful to all sorts of artificers, particularly to architects, engineers, shipwrights, millwrights, watchmakers, &cor any that work in a mechanical way : illustrated with forty-th

- Image ID: 2AXFWKM
The principles of mechanics : explaining and demonstrating the general laws of motion, the laws of gravity, motion of descending bodies, projectiles, mechanic powers, pendulums, centers of gravity, &cstrength and stress of timber, hydrostatics, and construction of machines : a work very necessary to be known, by all gentlemen, and others, that desire to have an insight into the works of nature and art : and extremely useful to all sorts of artificers, particularly to architects, engineers, shipwrights, millwrights, watchmakers, &cor any that work in a mechanical way : illustrated with forty-th
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Image ID: 2AXFWKM
The principles of mechanics : explaining and demonstrating the general laws of motion, the laws of gravity, motion of descending bodies, projectiles, mechanic powers, pendulums, centers of gravity, &cstrength and stress of timber, hydrostatics, and construction of machines : a work very necessary to be known, by all gentlemen, and others, that desire to have an insight into the works of nature and art : and extremely useful to all sorts of artificers, particularly to architects, engineers, shipwrights, millwrights, watchmakers, &cor any that work in a mechanical way : illustrated with forty-three copper-plates . WL.^a. i^S. 107 io8. Tiyi.^?.j- m r Sedl. IX. HYDROSTATICS. 127 height of the vefTel AC, (by Cor. 1. Prop. LXXXII.) but the ^ j ^weight of fuch a column of air is inlenfiblc in relped: of theexternal prcfTure, or the preffure of the height of the atmofphcrc.And therefore the compreirinri in every pare of the veflcl maybe looked upon to be the fame. Cor. I. In like manner the comprejfion of the air in any izvoplaces near the earths furface is very nearly the fame. For the difference is only the weight of a column of air,whofe height is the difference of the heights of the two places,which is very inconfiderable. Cor. 2. If air be comprejfed in any vejfd by the preffure of the ex-ternal air, its elaftic force is equal to the force and prefjure of the ex~ternal air. Cor. 3. The air does the fame thing by ilsfpring, as a non-elafiicfluid does by its weight or preffure. For the fpring or elafticity of the air is the force it exerts a-gainfl: the force of comprefiion, and therefore muft be equal to it. S C H O

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