Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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level'd on the top of a Tower, and ſhots were made therewith
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point blank, that is, paralel to the Horizon, let the Piece have a
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greater or leſs charge, ſo as that the ball may fall ſometimes a
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thouſand yards diſtant, ſometimes four thouſand, ſometimes ſix,
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ſometimes ten,
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&c.
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and all theſe ſhots ſhall curry or finiſh their
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ranges in times equal to each other, and every one equal to the
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time which the ball would take to paſs from the mouth of the
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Piece to the ground, being left, without other impulſe, to fall
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ſimply downwards in a perpendicular line. </
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>Now it ſeems a very
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admirable thing, that in the ſame ſhort time of its falling
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dicularly down to the ground, from the height of, ſuppoſe, an
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hundred yards, the ſame ball, being thruſt violently out of the
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Piece by the Fire, ſhould be able to paſs one while four hundred,
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another while a thouſand, another while four, another while ten
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thouſand yards, ſo as that the ſaid ball in all ſhots made point
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blank, always continueth an equal time in the air.</
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An admirable
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accident in the
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tion of projects.
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*By the length of
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the maſt he means
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the diſtance
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tween the
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deck and
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top.</
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* La palla.</
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>SALV. </
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>The conſideration for its novelty is very pretty, and if
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the effect be true, very admirable: and of the truth thereof, I
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make no queſtion: and were it not for the accidental impediment
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of the air, I verily believe, that, if at the time of the balls going
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out of the Piece, another were let fall from the ſame height
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rectly downwards, they would both come to the ground at the
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ſame inſtant, though that ſhould have curried ten thouſand
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miles in its range, and this but an hundred onely: preſuppoſing
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the ſurface of the Earth to be equal, which to be aſſured of, the
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experiment may be made upon ſome lake. </
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<
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>As for the impediment
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which might come from the air, it would conſiſt in retarding the
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extreme ſwift motion of the ſhot. </
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>Now, if you think fit, we will
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proceed to the ſolution of the other Objections, ſeeing that
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plicius
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(as far as I can ſee) is convinc'd of the nullity of this firſt,
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taken from things falling from on high downwards.</
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<
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>SIMP. </
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>I find not all my ſcruples removed, but it may be the
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fault is my own, as not being of ſo eaſie and quick an apprehenſion
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as
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Sagredus.
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And it ſeems to me, that if this motion, of which
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the ſtone did partake whilſt it was on the Round-top of the Ships
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Maſt, be, as you ſay, to conſerve it ſelf indelibly in the ſaid ſtone,
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even after it is ſeparated from the Ship, it would follow, that
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wiſe in caſe any one, riding a horſe that was upon his ſpeed, ſhould
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let a bowl drop out of his hand, that bowl being fallen to the
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ground would continue its motion and follow the horſes ſteps,
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without tarrying behind him: the which effect, I believe, is not
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to be ſeen, unleſs when he that is upon the horſe ſhould throw it
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with violence that way towards which he runneth; but otherwiſe,
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I believe it will ſtay on the ground in the ſame place where it
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fell.</
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