Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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[Figure 1]
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[Figure 2]
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[Figure 3]
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[Figure 4]
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[Figure 5]
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[Figure 6]
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[Figure 7]
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[Figure 8]
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[Figure 9]
Page: 37
[Figure 10]
Page: 41
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your Lordſhip ſhould have ſuch another
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Engine made for you) to have a hollow
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and tapering Pipe of Glaſs drawn out,
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whereof the Orifice above mentioned
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was the Baſis, and then to have the cone
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cut off with a hot Iron, within about an
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Inch of the Points (B C.) </
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>The uſe of the lip, is to ſuſtain the
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cover delineated in the ſecond Figure;
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where (D E) points out a braſs Ring, ſo
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caſt, as that it doth within and without
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cover the lip (B C) of the firſt Figure,
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and is cemented on upon it with a ſtrong
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and cloſe Cement. </
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>To the inward taper
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ing Orifice of this Ring (which is about
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three Inches over) are exquiſitely ground
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the ſides of the Braſs ſtopple (F G;) ſo
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that the concave ſuperficies of the one,
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and the convex of the other, may touch
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one another in ſo many places, as may
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leave as little acceſs, as poſſible, to the ex
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ternal Air: And in the midſt of this cover
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is left a hole (H I) of about half an inch
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over, invironed alſo with a ring or ſocket
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of the ſame mettal, and fitted likewiſe
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with a braſs ſtopple (K) made in the form
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of the Key of a ſtop-cock, and exactly
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ground into the hole (H I) it is to fill; ſo
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as that though it be turn'd round in the </
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