1dula was reckon'd to have made one and
twenty Recurſions, wherein the other
made but twenty: Yet this Experiment
ſeem'd to teach us little, ſave that the dif
ference betwixt the motion of ſuch a Pen
dulum in the common Air, and in one ex
ceedingly rarified, is ſcarce ſenſible in
Veſſels no bigger then our Receiver; e
ſpecially ſince though during this Expe
riment it held very well, yet we could
not ſuppoſe it to be altogether devoid of
Air. We obſerv'd alſo, that when the
Receiver was full of Air, the included
Pendulum continu'd its Recurſions about
fifteen minutes (or a quarter of an hour)
before it left off ſwinging; and that after
the exſuction of the Air, the Vibration
of the ſame Pendulum (being freſh put in
to motion) appear'd not (by a minutes
Watch) to laſt ſenſibly longer. So that
the event of this Experiment being other
then we expected, ſcarce afforded us any
other ſatisfaction, then that of our not
having omitted to try it. And whether
in caſe the tryal be made with a Pendulum
much leſs diſproportionate to the Air then
Steel is, the event will much better an
ſwer expectation, experience may be con
ſulted.
twenty Recurſions, wherein the other
made but twenty: Yet this Experiment
ſeem'd to teach us little, ſave that the dif
ference betwixt the motion of ſuch a Pen
dulum in the common Air, and in one ex
ceedingly rarified, is ſcarce ſenſible in
Veſſels no bigger then our Receiver; e
ſpecially ſince though during this Expe
riment it held very well, yet we could
not ſuppoſe it to be altogether devoid of
Air. We obſerv'd alſo, that when the
Receiver was full of Air, the included
Pendulum continu'd its Recurſions about
fifteen minutes (or a quarter of an hour)
before it left off ſwinging; and that after
the exſuction of the Air, the Vibration
of the ſame Pendulum (being freſh put in
to motion) appear'd not (by a minutes
Watch) to laſt ſenſibly longer. So that
the event of this Experiment being other
then we expected, ſcarce afforded us any
other ſatisfaction, then that of our not
having omitted to try it. And whether
in caſe the tryal be made with a Pendulum
much leſs diſproportionate to the Air then
Steel is, the event will much better an
ſwer expectation, experience may be con
ſulted.