1three Inches in Diameter (for, as it was
ſaid in the deſcription of our Engine, the
cavity of the Cylinder was no broader)
was able, uncompreſſ'd, not only to ſuſtain,
but even to drive up a weight of an hun
dred and odde pounds: for beſides the
weight of the whole Sucker it ſelf, which
amounts to ſome pounds, the weights an
nexed to it made up a hundred and three
pounds, beſides an Iron Bar, that by con
jecture weighed two pounds more; and
yet all theſe together fall ſomewhat ſhort
of the weight which we lately mention'd,
the reſiſtance of the Air to have held ſu
ſpended in the cavity of the Cylinder.
ſaid in the deſcription of our Engine, the
cavity of the Cylinder was no broader)
was able, uncompreſſ'd, not only to ſuſtain,
but even to drive up a weight of an hun
dred and odde pounds: for beſides the
weight of the whole Sucker it ſelf, which
amounts to ſome pounds, the weights an
nexed to it made up a hundred and three
pounds, beſides an Iron Bar, that by con
jecture weighed two pounds more; and
yet all theſe together fall ſomewhat ſhort
of the weight which we lately mention'd,
the reſiſtance of the Air to have held ſu
ſpended in the cavity of the Cylinder.
And though (as hath been already ac
knowledg'd) we cannot, peradventure,
obtain by the recited means ſo exact an
account as were to be wiſh'd, of what we
would diſcover: Yet, if it ſerve us to
ground Conjectures more approaching to
the Truth, then we have hitherto met
with, I hope it will be conſider'd (which
a famous Poet judiciouſly ſays)
knowledg'd) we cannot, peradventure,
obtain by the recited means ſo exact an
account as were to be wiſh'd, of what we
would diſcover: Yet, if it ſerve us to
ground Conjectures more approaching to
the Truth, then we have hitherto met
with, I hope it will be conſider'd (which
a famous Poet judiciouſly ſays)
Eſt quoddam prodire tenus, ſi non da
tur ultra.
tur ultra.
Peradventure it will not be imperti-