Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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what birds, what balls, and what other pretty things are here?</
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<
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>SIMP. </
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>Theſe are balls which come from the concave of the
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Moon.</
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>SAGR. </
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<
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>And what is this?</
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<
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>SIMP. </
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<
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>This is a kind of Shell-fiſh, which here at
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Venice
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they
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call
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buovoli
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; and this alſo came from the Moons concave.</
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>SAGR. Indeed, it ſeems then, that the Moon hath a great
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er over theſe Oyſter-fiſhes, which we call ^{*}
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armed ſiſbes.
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* Peſci armai,
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or
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armati.</
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>SIMP. </
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>And this is that calculation, which I mentioned, of this
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Journey in a natural day, in an hour, in a firſt minute, and in a
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ſecond, which a point of the Earth would make placed under the
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Equinoctial, and alſo in the parallel of 48
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gr.
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And then followeth
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this, which I doubted I had committed ſome miſtake in reciting,
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therefore let us read it.
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His poſitis, neceſſe est, terra circulariter
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mota, omnia ex aëre eidem, &c. </
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>Quod ſi haſce pilas æquales
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nemus pondere, magnitudine, gravitate, & in concavo Sphæræ
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naris poſitas libero deſcenſui permittamus, ſi motum deorſum
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mus celeritate motui circum, (quod tamen ſecus eſt, cum pila A,
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&c.) elabentur minimum (ut multum cedamus adverſariis) dies
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ſex: quo tempore ſexies circa terram, &c. [In Engliſb thus.]
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Theſe things being ſuppoſed, it is neceſſary, the Earth being
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cularly moved, that all things from the air to the ſame, &c. </
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<
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>So
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that if we ſuppoſe theſe balls to be equal in magnitude and
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vity, and being placed in the concave of the Lunar Sphere, we
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permit them a free deſcent, and if we make the motion
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wards equal in velocity to the motion about, (which nevertheleſs
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is otherwiſe, if the ball A, &c.) they ſhall be falling at leaſt (that
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we may grant much to our adverſaries) ſix dayes; in which time
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they ſhall be turned ſix times about the Earth, &c.</
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<
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>SALV. </
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<
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>You have but too faithfully cited the argument of this
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perſon. </
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<
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>From hence you may collect
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Simplicius,
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with what
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tion they ought to proceed, who would give themſelves up to
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lieve others in thoſe things, which perhaps they do not believe
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themſelves. </
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<
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>For me thinks it a thing impoſſible, but that this
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thor was adviſed, that he did deſign to himſelf a circle, whoſe
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meter (which amongſt Mathematicians, is leſſe than one third part
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of the circumference) is above 72 times bigger than it ſelf: an
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errour that affirmeth that to be conſiderably more than 200,
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which is leſſe than one.</
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<
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>SAGR. </
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<
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>It may be, that theſe Mathematical proportions, which
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are true in abſtract, being once applied in concrete to Phyſical and
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Elementary circles, do not ſo exactly agree: And yet, I think,
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that the Cooper, to find the ſemidiameter of the bottom, which he
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is to fit to the Cask, doth make uſe of the rule of Mathematicians
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in abſtract, although ſuch bottomes be things meerly material, </
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