Boyle, Robert New experiments physico-mechanicall, touching the spring of the air and its effects 1660

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9
self: It consists of two principal parts; a
glass Vessel, and a Pump to draw the Air
out of it.

The former of these (which we, with
the Glass men, shall often call a Receiver,
for its affinity to the large Vessels of that
name, used by Chymists) consists of a
Glass with a wide hole at the top, of a
cover to that hole, and of a stop-cock
fastned to the end of the neck, at the
bottom.

The shape of the Glass, you will find
express'd in the first Figure of the annex­
ed Scheme. And for the size of it, it
contain'd about 30 Wine Quarts, each of
them containing near two pound (of 16
Ounces to the pound) of water: We
should have been better pleas'd with a
more capacious Vessel, but the Glass-men
professed themselves unable to blow a
larger, of such a thickness and shape as
was requisite to our purpose.

At the very top of the Vessel, (A) you
may observe a round hole, whose Dia­
meter (B C) is of about four inches; and
whereof, the Orifice is incircled with a
lip of Glass, almost an inch high: For
the making of which lip, it was requisite
(to mention that upon the by, in case