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PROP. VIII.

A Piece whose greatest horizontalRandon is 2400, Quere the greatesthorizontal Distance from which, thatPiece can strike au Object on the Topof a Perpendicular whose Height is400.

Place the Square to 400, on the Dia-meter ; and 2000 on the Index (theComplement of the Height to the gi-ven gr. Ran.) will cut 1685 on theSquare which is the horizontalDistancerequired.

PROP. IX.

A Piece whose gr. Ran. on the Planeof the Horizon is 2400, Quere thegreatest Height which that Piece canreach on a Perpendicular whose hori-zontal Distance is 1 <58 5.

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