104 POOk VI.

Mechanic Pomers.

OF THE

BOOK. VI.

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1 Lthough the Wedge be a ſimple Inſtrument, and there.

fore Of ſome, is ſcarcely aſcribed to the number ofEngins, nevertheleſs it is of ſuch force, that deſervedly it findsa place here. N

The Wedge is a triangular Priſme, whoſe two rectangles,end in a common right line. N n

And chat it may be uſeful, it ought to be made of ſolidmatter, as of Iron, or Wood , and ſuch like.

Its uſe is in the cleaving of Wood , parting of Stones, anddividing other bodies that may be cleft, or cloven; a ſlit beingmade in the body, the edge of the Wedge is thruſt in, andand a ſtrong percuilion being added, forces in the Wedge.

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PR OP OS. I.A Theorem.The Force 7 the Nedge explained.

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Fig. 86. lvers reaſons are alledg'd for the force of theWedge, and firſt from Ariſtotle ; in Queſtion 17,

the Wedge is recalled to a double Leaver of the firit Kind, inchis manner, to wit, let the Wedge be A BC, Ariſtotle under-ſtands