| Boyle, Robert New experiments physico-mechanicall, touching the spring of the air and its effects 1660 |
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and R. Hook (who hath also the Honor to
be known to your Lordship, and was with
me when I had these things under consi
deration) to contrive some Air Pump,
that might not, like the other, need to
be kept under water (which on divers oc
casions is inconvenient) & might be more
easily manag'd: And after an unsuccessful
try all or two of ways propos'd by o
thers, the last nam'd Person fitted me
with a Pump, anon to be describ'd.
And
thus the first Imperfection of the German
Engine, was in good measure, though
not perfectly, remedy'd: And to supply
the second desect, it was considered that
it would not perhaps prove impossible to
leave in the Glass to be empty'd, a hole
large enough to put in a Mans Arm
cloath'd; and consequently other Bodies,
not bigger then it, or longer then the in
side of the Vessel.
And this Design
seem'd the more hopefull, because I re
membred, that having several years be
fore often made the Experiment De Va
cuo with my own hands; I had, to exa
mine some conjectures that occurr'd to
me about it, caused Glasses to be made
with a hole at that end, which uses to be
seal'd up, and had nevertheless been able
search