Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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SAGR. Stay a little, I entreat you, Salviatus, till I have
pounded
a certain conceit touching theſe ſhooters of birds flying,
whoſe
proceeding I believe to be the ſame which you relate, and
believe
the effect of hitting the bird doth likewiſe follow: but yet
I
cannot think that act altogether conformable to this of ſhooting
in
great Guns, which ought to hit as well when the piece and mark
moveth
, as when they both ſtand ſtill; and theſe, in my opinion,
are
the particulars in which they diſagree.
In ſhooting with a
great
Gun both it and the mark move with equal velocity, being
both
tranſported by the motion of the Terreſtrial Globe: and
beit
ſometimes the piece being planted more towards the Pole,
than
the mark, and conſequently its motion being ſomewhat
er
than the motion of the mark, as being made in a leſſer circle,
ſuch
a difference is inſenſible, at that little diſtance of the piece
from
the mark: but in the ſhot of the Fowler the motion of the
Fowling-piece
wherewith it goeth following the bird, is very ſlow
in
compariſon of the flight of the ſaid bird; whence me thinks it
ſhould
follow, that that ſmall motion which the turning of the
Birding-piece
conferreth on the bullet that is within it, cannot,
when
it is once gone forth of it, multiply it ſelf in the air, untill it
come
to equal the velocity of the birds flight, ſo as that the ſaid bullet
ſhould
always keep direct upon it: nay, me thinketh the bird
would
anticipate it and leave it behind.
Let me add, that in this
act
, the air through which the bullet is to paſs, partaketh not of the
motion
of the bird: whereas in the caſe of the Canon, both it,
the
mark, and the intermediate air, do equally partake of the
mon
diurnal motion.
So that the true cauſe of the Marks-man
his
hitting the mark, as it ſhould ſeem, moreover and beſides the

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