Boyle, Robert - New experiments physico-mechanicall, touching the spring of the air and its effects

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1your Lordſhip ſhould have ſuch another
Engine made for you) to have a hollow
and tapering Pipe of Glaſs drawn out,
whereof the Orifice above mentioned
was the Baſis, and then to have the cone
cut off with a hot Iron, within about an
Inch of the Points (B C.)

The uſe of the lip, is to ſuſtain the
cover delineated in the ſecond Figure;
where (D E) points out a braſs Ring, ſo
caſt, as that it doth within and without
cover the lip (B C) of the firſt Figure,
and is cemented on upon it with a ſtrong
and cloſe Cement. To the inward taper
ing Orifice of this Ring (which is about
three Inches over) are exquiſitely ground
the ſides of the Braſs ſtopple (F G;) ſo
that the concave ſuperficies of the one,
and the convex of the other, may touch
one another in ſo many places, as may
leave as little acceſs, as poſſible, to the ex
ternal Air: And in the midſt of this cover
is left a hole (H I) of about half an inch
over, invironed alſo with a ring or ſocket
of the ſame mettal, and fitted likewiſe
with a braſs ſtopple (K) made in the form
of the Key of a ſtop-cock, and exactly
ground into the hole (H I) it is to fill; ſo
as that though it be turn'd round in the

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