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The doctrine of projectiles demonstrated and apply'd to all the most useful problems in practical gunnery : to which is added, the description and use of a new mathematical instrument, together with serveral curious properties of projectiles never before publish'd / by William Starrat
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i6- Of Simple MotiomSCHOLIUM II.

If any determined Leflgtk of Spaceand Time are made the Integers , asan Inch, a Foot, or a Yard, &c. aSecond, a Minute; an Hour, Sfc.from any two of Y, 7 °, & C given,the third may be found ; for, S~T

x C, and6'=-^r, also 7 ^. E. g: If

C the Celerity, be at the Rate of 6Feet in a Second of Time, and if Tbe 6o Seconds, or i Minute, thenwill 7 ° x C = 6o x 6 = 360 Y theSpace passed over in a Minute, %?c.as before.

In like Manner, if B consists of 8jfuch Parts, as b contains 6, and if C,be to c, as 7 : 5, then will AT, theMomentum of B y be to m, tile Mo-mentum of b, as jd, to 30, for, bythe j th. Law, M:m :: BxCibx c,

that

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