Archimedes Texts

10
your 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