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

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1
SAGR. And cannot you, Simplicius, give a reaſon for this,
without others prompting you?
SIMP. Very good, I can ſo; but leave your jeering.
SAGR. In like manner you do know the reaſon of this other
alſo.
Tell me therefore; know you that a thing which moveth,
being impeded ſtands ſtill?
SIMP. I know it doth, if the impediment be ſo great as to
ſuffice.
SAGR. Do you know, that moving upon the Earth is a greater
impediment to the moveable, than moving in the air, the Earth
ing rough and hard, and the air ſoft and yielding?
SIMP. And knowing this, I know that the top will turn faſter
in the air, than on the ground, ſo that my knowledg is quite
trary to what you think it.
SAGR. Fair and ſoftly, Simplicius. You know that in the
parts of a moveable, that turneth about its centre, there are found
motions towards all ſides; ſo that ſome aſcend, others deſcend;
ſome go forwards, others backwards?
SIMP. I know it, and Aristotle taught me the ſame.
SAGR. And with what demonſtration, I pray you?
SIMP. With that of ſenſe.
SAGR. Ariſtotle, then, hath made you ſee that which without
him you would not have ſeen?
Did he ever lend you his eyes?
You would ſay, that Ariſtotle hath told, advertiſed, remembered
you of the ſame; and not taught you it.
When then a top,
out changing place, turns round, (or in the childrens phraſe,
eth) not paralel, but erect to the Horizon, ſome of its parts aſcend,
and the oppoſite deſcend; the ſuperiour go one way, the
riour another.
Fancie now to your ſelf, a top, that without
ging place, ſwiftly turns round in that manner, and ſtands
ded in the air, and that in that manner turning, it be let fall to the
Earth perpendicularly, do you believe, that when it is arrived at
the ground, it will continue to turn round in the ſame manner,
without changing place, as before?
SIMP. No, Sir.
SAGR. What will it do then?
SIMP. It will run along the ground very faſt.
SAGR. And towards what part?
SIMP. Towards that, whither its ^{*}reeling carrieth
* Vertigine.
SAGR. In its reeling there are parts, that is the uppermoſt, which
do move contrary to the inferiour; therefore you muſt inſtance
which it ſhall obey: for as to the parts aſcending and deſcending,
the one kind will not yield to the other; nor will they all go
downwards, being hindered by the Earth, nor upwards as being
heavy.