Galilei, Galileo
,
The systems of the world
,
1661
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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. </
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<
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>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. </
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<
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>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? </
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<
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>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.</
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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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<
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>SAGR. </
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<
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>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. </
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<
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>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. </
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<
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>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. </
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<
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>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 </
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