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

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SALV. Let us yield, Simplicius, for the buſineſs is juſt as he

ſaith
.
And now from this diſcourſe let us come to underſtand the
reaſon
of a Venatorian Problem, of thoſe Fowlers who with their
guns
ſhoot a bird flying; and becauſe I did imagine, that in regard
the
bird flieth a great pace, therefore they ſhould aim their ſhot far
from
the bird, anticipating its flight for a certain ſpace, and more
or
leſs according to its velocity and the diſtance of the bird, that
ſo
the bullet haſting directly to the mark aimed at, it might come
to
arrive at the ſelf ſame time in the ſame point with its motion,
and
the bird with its flight, and by that means one to encounter
the
other: and asking one of them, if their practiſe was not ſo
to
do; He told me, no; but that the ſlight was very eaſie and
certain
, and that they took aim juſt in the ſame manner as if they
had
ſhot at a bird that did ſit ſtill; that is, they made the flying
bird
their mark, and by moving their fowling-piece they followed
her
, keeping their aim ſtill full upon her, till ſuch time as they let
fly
, and in this manner ſhot her as they did others ſitting ſtill.
It is
neceſſary
therefore that that motion, though ſlow, which the
ing-piece
maketh in turning and following after the flight of the
bird
do communicate it ſelf to the bullet alſo, and that it be joyned
with
that of the fire; ſo that the ball hath from the fire the
tion
directly upwards, and from the concave Cylinder of the barrel
the
declination according to the flight of the Bird, juſt as was ſaid
before
of the ſhot of a Canon; where the ball receiveth from the
fire
a virtue of mounting upwards towards the Zenith, and from
the
motion of the Earth its winding towards the Eaſt, and of both
maketh
a compound motion that followeth the courſe of the
Earth
, and that to the beholder ſeemeth onely to go directly
wards
, and return again downwards by the ſame line.
The
ing
therefore of the gun continually directed towards the mark,
maketh
the ſhoot hit right, and that you may keep your gun
rected
to the mark, in caſe the mark ſtands ſtill, you muſt alſo hold

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