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

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55
ally supposing the dilatation not to be re­
strain'd by the Bladder.

SInce we wrote the other day the former
Experiment, we have met with some
Glasses not very unfit for our purpose;
by means of which we are now able, with
a little more trouble, to measure the ex­
pansion of the Air a great deal more ac­
curately then we could by the help of the
above-mention'd Bladder, which was
much to narrow to allow the Air its ut­
most distention.

We took then first a Cylindrical Pipe
of Glass, whose bore was about a quarter
of an Inch in Diameter: this Pipe was so
bent and doubled, that, notwithstanding
its being about two foot in length, it
might have been shut up into a small Re­
ceiver, not a Foot high: But by mis­
fortune it crack'd in the cooling, whereby
we were reduced to make use of one part
which was straight and intire, but exceed­
ed not six or seven Inches. This little
Tube was open at one end; and at the
other, where it was Hermetically seal'd,
had a small Glass bubble to receive the
Air whose dilatation was to be measur'd.