Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Earth, doth not onely follow the courſe of that perſon, but doth
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much out go him. </
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>Which Problem is connexed with this, that
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the moveable being thrown by the projicient above the plane of
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the Horizon, may acquire new velocity, greater by far than that
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confer'd upon it by the projicient. </
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>The which effect I have with
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admiration obſerved, in looking upon thoſe who uſe the ſport of
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tops, which, ſo ſoon as they are ſet out of the hand, are ſeen to
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move in the air with a certain velocity, the which they afterwards
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much encreaſe at their coming to the ground; and if whipping
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them, they rub at any uneven place that makes them skip on high,
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they are ſeen to move very ſlowly through the air, and falling
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gain to the Earth, they ſtill come to move with a greater velocity:
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But that which is yet more ſtrange, I have farther obſerved, that
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they not onely turn always more ſwiftly on the ground, than in
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the air, but of two ſpaces both upon the Earth, ſometimes a
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tion in the ſecond ſpace is more ſwift than in the firſt. </
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>Now what
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would
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Simplicius
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ſay to this?</
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Sundry curious
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Problems,
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ing the motions of
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projects.
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>SIMP. </
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>He would ſay in the firſt place, that he had never made
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ſuch an obſervation. </
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>Secondly, he would ſay, that he did not
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lieve the ſame. </
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>He would ſay again, in the third place, that if
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you could aſſure him thereof, and demonſtratively convince him of
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the ſame, he would account you a great Dæmon.</
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>SAGR. </
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>I hope then that it is one of the Socratick, not infernal
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ones. </
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>But that I may make you underſtand this particular, you
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muſt know, that if a perſon apprehend not a truth of himſelf, it
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is impoſſible that others ſhould make him underſtand it: I may
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deed inſtruct you in thoſe things which are neither true nor falſe;
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but the true, that is, the neceſſary, namely, ſuch as it is impoſſible
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ſhould be otherwiſe, every common capacity either comprehendeth
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them of himſelf, or elſe it is impoſſible he ſhould ever know them.
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<
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>And of this opinion I am confident is
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Salviatus
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alſo: and
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fore I tell you, that the reaſons of the preſent Problems are known
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by you, but it may be, not apprehended.</
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<
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>SIMP. </
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<
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>Let us, for the preſent, paſs by that controverſie, and
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permit me to plead ignorance of theſe things you ſpeak of, and try
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whether you can make me capable of underſtanding theſe
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blems.</
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>SAGR. </
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>This firſt dependeth upon another, which is, Whence
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cometh it, that ſetting a top with the laſh, it runneth farther, and
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conſequently with greater force, than when its ſet with the
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gers?</
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<
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>SIMP.
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Ariſtotle
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alſo makes certain Problems about theſe kinds
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of projects.</
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<
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>SALV. </
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>He doth ſo; and very ingenious they are:
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ly, That, Whence it cometh to paſs that round tops run better than
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the ſquare?</
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