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

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<archimedes>
<text>
<body>
<chap>
<p type="main">
<s>But although the Column ſtand erect at Right-Angles, yet for all
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that, the Riſe along the Screw, folded about the Column, is not of
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a greater Elevation than of 1/3 of a Right Angle, it being generated
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by the Elevation of the Chanel A C: Therefore if we incline the
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Column but 1/3 of the
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<lb/>
ſaid Right Angle, and
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a little more, as we ſee
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I K H M, there is a
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Tranſition and Moti­
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on along the Chanel
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I L: Therefore the
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Water from the point
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I to the point L ſhall
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move deſcending, and
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the Screw being turned
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of it ſhall ſucceſſively
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diſpoſe or preſent
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themſelves to the Wa­
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ter in the ſame Poſition as the part I L: Whereupon the Water
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ſhall go ſucceſſively deſcending, and in the end ſhall be found to
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be aſcended from the point I to the point H. </s>
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ble a thing it is, I leave ſuch to judge who ſhall perfectly have un­
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derſtood it. </s>
<s>And by what hath been ſaid, we come to know, That
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the Screw for raiſing of Water ought to be inclined a little more
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than the quantity of the Angle of the Triangle by which the ſaid
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Screw is deſcribed.</s>
</p>
<s>
<emph type="italics"/>
Of the Force of the
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HAMMER, MALLET, or BEETLE.
<emph.end type="italics"/>
</s>
</p>
<p type="main">
<s>The Inveſtigation of the cauſe of the Force of theſe Percuti­
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ents is neceſſary for many Reaſons: and firſt, becauſe that
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there appeareth in it much more matter of admiration than
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is obſerved in any other Mechanick Inſtrument whatſoever. </s>
<s>For
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ſtriking with the Hammer upon a Nail, which is to be driven into
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a very tough Poſt, or with the Beetle upon a Stake that is to pene­
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trate into very ſtiffe ground, we ſee, that by the ſole vertue of the
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blow of the Percutient both the one and the other is thruſt for­
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wards: ſo that without that, only laying the Beetle upon the
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Nail or Stake it will not move then, nay, more, although you
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ſhould lay upon them a Weight very much heavier than the ſaid
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Beetle. </s>
<s>An effect truly admirable, and ſo much the more worthy
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of Contemplation, in that, as I conceive, none of thoſe who have </s>
</p>
</chap>
</body>
</text>
</archimedes>