Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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588000000 yards (for ſo many are in 56 diameters of the Earth)
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be paſſed? </
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<
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>The rule for this work is, that the third number muſt
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be multiplied by the ſquare of the ſecond, of which doth come
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14700000000, which ought to be divided by the firſt, that is, by
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100, and the root ſquare of the quotient, that is, 12124 is the
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number ſought, namely 12124
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min. </
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<
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>ſecun.
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of an hour, which are
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3 hours, 22
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min. </
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<
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and 4 ſeconds.</
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<
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>SAGR. </
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<
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>I have ſeen the working, but I know nothing of the
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reaſon for ſo working, nor do I now think it a time to ask it.</
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>SALV. </
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<
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>Yet I will give it, though you do not ask it, becauſe it
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is very eaſie. </
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<
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>Let us mark theſe three numbers with the Letters
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A firſt, B ſecond, C
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third. </
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>A and C are the
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numbers of the ſpaces,
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B is the number of the
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time; the fourth number
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is ſought, of the time
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alſo. </
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<
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>And becauſe we
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know, that look what
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proportion the ſpace A,
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hath to the ſpuace C, the
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ſame proportion ſhall the
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ſquare of the time B
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have to the ſqare of the
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time, which is ſought.
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<
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>Therefore by the Golden Rule, let the number C be
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plied by the ſquare of the number B, and let the product be
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vided by the number A, and the quotient ſhall be the ſquare of
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the number ſought, and its ſquare root ſhall be the number it ſelf
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that is ſought. </
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<
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>Now you ſee how eaſie it is to be underſtood.</
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<
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>SAGR. </
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<
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>So are all truths, when once they are found out, but the
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difficulty lyeth in finding them. </
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<
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>I very well apprehend it, and kindly
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thank you. </
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>And if there remain any other curioſity touching this
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point, I pray you let us hear it; for if I may ſpeak my mind, I
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will with the favour of
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Simplicius,
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that from your diſcourſes I
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wayes learn ſome new motion, but from thoſe of his
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phers, I do not remember that I have learn't any thing of
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ment.</
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<
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>SALV. </
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<
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>There might be much more ſaid touching theſe local
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motions; but according to agreement, we will reſerve it to a
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ticular conference, and for the preſent I will ſpeak ſomething
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touching the Author named by
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Simplicius,
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who thinketh he hath
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given a great advantage to the adverſe party in granting that, that
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Canon bullet in falling from the concave of the Moon may
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ſcend with a velocity equal to the velocity wherewith it would </
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