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

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1check that is immoveable, they ſhall fly out with great
ſity
: the ſame effect following in that caſe, which we ſee dayly
to
fall out in a boat that running a ſwift courſe, runs a-ground, or
meets
with ſome ſudden ſtop, for all thoſe in the boat, being

prized
, ſtumble forwards, and fall towards the part whither the
boat
ſteered.
And in caſe the Earth ſhould meet with ſuch a
check
, as ſhould be able to reſiſt and arreſt its vertigo, then indeed
I
do believe that not onely beaſts, buildings and cities, but
tains
, lakes and ſeas would overturn, and the globe it ſelf would
go
near to ſhake in pieces; but nothing of all this concerns our
preſent
purpoſe, for we ſpeak of what may follow to the motion
of
the Earth, it being turn'd round uniformly, and quietly about
its
own centre, howbeit with a great velocity.
That likewiſe
which
you ſay of the ſlings, is true in part; but was not alledged
by
Salviatus, as a thing that punctually agreed with the matter
whereof
we treat, but onely, as an example, for ſo in groſs it may
prompt
us in the more accurate conſideration of that point,
ther
, the velocity increaſing at any rate, the cauſe of the
ction
doth increaſe at the ſame rate: ſo that v. g. if a wheel of
ten
yards diameter, moving in ſuch a manner that a point of its
circumference
will paſs an hundred yards in a minute of an hour,
and
ſo hath an impetus able to extrude a ſtone, that ſame impetus
ſhall
be increaſed an hundred thouſand times in a wheel of a million
of
yards diameter; the which Salviatus denieth, and I incline to his
opinion
; but not knowing the reaſon thereof, I have requeſted it
of
him, and ſtand impatiently expecting it.
SALV. It is that indeed I mean, and your nimbleneſſe of wit
hath
been too hard for my craftineſſe, but if I have been too
ſhort
in asking the queſtion, I doubt whether Sagredus hath been
full
enough in his anſwer to ſatisſie the demand; and whether
there
be not in the moveable, beſides the natural inclination to the

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