94 Problems of, &c.

the lower Elevation, and R : S, r

|8o°. zj r :: 8000 : 1822 the Distanceat the higher Elevation.

CASE XVII

A Piece whose gr. Ran. with 28Pounds ofPowder is 8000, Quere herCharge to strike an Object at Right-Angles whole Distance is 1822, andwhole Surface reclines 42 0 !

It’s plain, the Direction which strikesthis Object at Right-Angles must be

an Elevation of42-°. Then T, 2 J 41° :A :: 1822 : 1832 - thegreatest Ran-don for the Charge required, and

a ft

1/8000: v/18 3 2.28 :13.3 the Chargerequir’d.

CHAP.