Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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with that which hath been ſaid already, namely, that in caſe the
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Earth ſhould move, the ſhots made Eaſtward would prove too
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high, &c. </
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<
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>the ball, as it is probable, being to move along the
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gent.</
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<
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>SALV. </
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>But if I ſhould ſay, that ſo it falleth out upon triall,
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how would you cenſure me?</
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<
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>SIMP. </
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>It is neceſſary to proceed to experiments for the
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ving of it.</
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>SALV. </
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>But do you think, that there is to be found a Gunner ſo
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skilful, as to hit the mark at every ſhoot, in a diſtance of
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v.g.
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five
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hundred paces?</
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>SIMP. </
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<
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>No Sir; nay I believe that there is no one, how good a
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marks-man ſoever that would promiſe to come within a pace of
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the mark,</
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<
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>SALV. </
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>How can we then, with ſhots ſo uncertain, aſſure our
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ſelves of that which is in diſpute?</
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>SIMP. </
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>We may be aſſured thereof two wayes; one, by
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king many ſhots; the other, becauſe in reſpect of the great
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city of the Earths motion, the deviation from the mark would in
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my opinion be very great.</
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<
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>Very great, that is more than one pace; in regard that
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the varying ſo much, yea and more, is granted to happen ordinarily
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even in the Earths mobility.</
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>SIMP. </
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<
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>I verily believe the variation from the mark would be
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more than
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A Computation
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how much the
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ges of great ſhot
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ought to vary from
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the marke, the
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Earths motion
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ing granted.
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<
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>SALV. </
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<
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>Now I deſire that for our ſatisfaction we do make thus
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in groſſe a ſlight calculation, if you conſent thereto, which will
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ſtand us in ſtead likewiſe (if the computation ſucceed as I expect)
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for a warning how we do in other occurrences ſuffer our ſelves, as
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the ſaying is, to be taken with the enemies ſhouts, and ſurrender
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up our belief to what ever firſt preſents it ſelf to our fancy. </
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<
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>And
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now to give all advantages to the
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Peripateticks
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and
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Tychonicks,
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let us ſuppoſe our ſelves to be under the Equinoctial, there to ſhoot
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a piece of Ordinance point blank Eaſtwards at a mark five
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dred paces off. </
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<
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>Firſt, let us ſee thus (as I ſaid) in a level, what
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time the ſhot after it is gone out of the Piece taketh to arrive at
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the mark; which we know to be very little, and is certainly no
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more than that wherein a travailer walketh two ſteps, which alſo
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is leſs than the ſecond of a minute of an hour; for ſuppoſing
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that the travailer walketh three miles in an hour, which are nine
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thouſand paces, being that an hour containes three thouſand, ſix
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hundred ſecond minutes, the travailer walketh two ſteps and an
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half in a ſecond, a ſecond therefore is more than the time of the
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balls motion. </
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<
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>And for that the diurnal revolution is twenty four
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hours, the Weſtern horizon riſeth fifteen degrees in an hour, that </
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