Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667
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              your gun ſtill; and if the mark ſhall move, the gun muſt be kept upon
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              the mark by moving. </s>
              <s>And upon this dependeth the proper anſwer
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              to the other argument taken from the ſhot of a Canon, at the
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              mark placed towards the South or North: wherein is alledged,
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              that if the Earth ſhould move, the ſhots would all range
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              ward of the mark, becauſe that in the time whilſt the ball, being
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              forc'd out of the Piece, goeth through the air to the mark, the ſaid
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              mark being carried toward the Eaſt, would leave the ball to the
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              Weſtward. </s>
              <s>I anſwer therefore, demanding whether if the
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              non be aimed true at the mark, and permitted ſo to continue, it
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              will conſtantly hit the ſaid mark, whether the Earth move or ſtand
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              ſtill? </s>
              <s>It muſt be replied, that the aim altereth not at all, for if
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              the mark doth ſtand ſtill, the Piece alſo doth ſtand ſtill, and if it,
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              being tranſported by the Earths motion, doth move, the Piece doth
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              alſo move at the ſame rate, and, the aim maintained, the ſhot
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              proveth always true, as by what hath been ſaid above, is
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              feſt.</s>
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              The manner how
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              Fowlers ſhoot birds
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              flying.
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              The anſwer to
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              the objection tak n
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              from the ſhots of
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              great Guns made
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              towards the North
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              and South.
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              <s>SAGR. </s>
              <s>Stay a little, I entreat you,
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              Salviatus,
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              till I have
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              pounded a certain conceit touching theſe ſhooters of birds flying,
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              whoſe proceeding I believe to be the ſame which you relate, and
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              believe the effect of hitting the bird doth likewiſe follow: but yet
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              I cannot think that act altogether conformable to this of ſhooting
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              in great Guns, which ought to hit as well when the piece and mark
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              moveth, as when they both ſtand ſtill; and theſe, in my opinion,
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              are the particulars in which they diſagree. </s>
              <s>In ſhooting with a
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              great Gun both it and the mark move with equal velocity, being
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              both tranſported by the motion of the Terreſtrial Globe: and
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              beit ſometimes the piece being planted more towards the Pole,
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              than the mark, and conſequently its motion being ſomewhat
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              er than the motion of the mark, as being made in a leſſer circle,
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              ſuch a difference is inſenſible, at that little diſtance of the piece
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              from the mark: but in the ſhot of the Fowler the motion of the
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              Fowling-piece wherewith it goeth following the bird, is very ſlow
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              in compariſon of the flight of the ſaid bird; whence me thinks it
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              ſhould follow, that that ſmall motion which the turning of the
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              Birding-piece conferreth on the bullet that is within it, cannot,
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              when it is once gone forth of it, multiply it ſelf in the air, untill it
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              come to equal the velocity of the birds flight, ſo as that the ſaid bullet
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              ſhould always keep direct upon it: nay, me thinketh the bird
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              would anticipate it and leave it behind. </s>
              <s>Let me add, that in this
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              act, the air through which the bullet is to paſs, partaketh not of the
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              motion of the bird: whereas in the caſe of the Canon, both it,
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              the mark, and the intermediate air, do equally partake of the
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              mon diurnal motion. </s>
              <s>So that the true cauſe of the Marks-man
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              his hitting the mark, as it ſhould ſeem, moreover and beſides the </s>
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