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

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1what birds, what balls, and what other pretty things are here?
SIMP. Theſe are balls which come from the concave of the
SAGR. And what is this?
SIMP. This is a kind of Shell-fiſh, which here at Venice they
call buovoli; and this alſo came from the Moons concave.
SAGR. Indeed, it ſeems then, that the Moon hath a great

er over theſe Oyſter-fiſhes, which we call ^{*} armed ſiſbes.
* Peſci armai, or
SIMP. And this is that calculation, which I mentioned, of this
Journey in a natural day, in an hour, in a firſt minute, and in a
ſecond, which a point of the Earth would make placed under the
Equinoctial, and alſo in the parallel of 48 gr. And then followeth
this, which I doubted I had committed ſome miſtake in reciting,
therefore let us read it. His poſitis, neceſſe est, terra circulariter
mota, omnia ex aëre eidem, &c.
Quod ſi haſce pilas æquales
nemus pondere, magnitudine, gravitate, & in concavo Sphæræ
naris poſitas libero deſcenſui permittamus, ſi motum deorſum
mus celeritate motui circum, (quod tamen ſecus eſt, cum pila A,
&c.) elabentur minimum (ut multum cedamus adverſariis) dies
ſex: quo tempore ſexies circa terram, &c. [In Engliſb thus.]
Theſe things being ſuppoſed, it is neceſſary, the Earth being
cularly moved, that all things from the air to the ſame, &c.
that if we ſuppoſe theſe balls to be equal in magnitude and
vity, and being placed in the concave of the Lunar Sphere, we
permit them a free deſcent, and if we make the motion
wards equal in velocity to the motion about, (which nevertheleſs
is otherwiſe, if the ball A, &c.) they ſhall be falling at leaſt (that
we may grant much to our adverſaries) ſix dayes; in which time
they ſhall be turned ſix times about the Earth, &c.
SALV. You have but too faithfully cited the argument of this
From hence you may collect Simplicius, with what
tion they ought to proceed, who would give themſelves up to
lieve others in thoſe things, which perhaps they do not believe
For me thinks it a thing impoſſible, but that this
thor was adviſed, that he did deſign to himſelf a circle, whoſe
meter (which amongſt Mathematicians, is leſſe than one third part
of the circumference) is above 72 times bigger than it ſelf: an
errour that affirmeth that to be conſiderably more than 200,
which is leſſe than one.
SAGR. It may be, that theſe Mathematical proportions, which
are true in abſtract, being once applied in concrete to Phyſical and
Elementary circles, do not ſo exactly agree: And yet, I think,
that the Cooper, to find the ſemidiameter of the bottom, which he
is to fit to the Cask, doth make uſe of the rule of Mathematicians
in abſtract, although ſuch bottomes be things meerly material,

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