1from the cover of the Receiver to which
it was faſten'd. Then (by inclining the
Engine) we made the Pendulum ſwing too
and fro in it, and deſcrib'd as long Arches
as in the capacity of ſo brittle a Veſſel we
thought ſafe and convenient. And one of
the Aſſiſtants telling the recurſions of the
other Pendulum hanging in the free Air,
by a ſtring of about the ſame length, we
ſhorten'd and lengthen'd this other Pen
dulum, till it appear'd to keep the ſame
pace in its Vibrations, with that ſhut up in
the Receiver. Then having carefully
drawn away the Air, we did again ſet the
Pendulum in the Receiver a vibrating;
and giving the other Pendulum ſuch a mo
tion as made it deſcribe an Arch, accord
ing to ones gheſs, equal to that of the in
cluded Pendulum; we reckon'd, one of
us, the Recurſions of that Pendulum which
was ſwinging within the Receiver; and
another of us that which was moving in
(that which one would think a much more
reſiſting medinm) the Air. But once, one
of us reckon'd near two and twenty Re
curſions of the included Pendulum, whilſt
the other reckon'd but twenty of the Pen
dulum that vibrated without. And an
other time alſo, the former of theſe Pen-
it was faſten'd. Then (by inclining the
Engine) we made the Pendulum ſwing too
and fro in it, and deſcrib'd as long Arches
as in the capacity of ſo brittle a Veſſel we
thought ſafe and convenient. And one of
the Aſſiſtants telling the recurſions of the
other Pendulum hanging in the free Air,
by a ſtring of about the ſame length, we
ſhorten'd and lengthen'd this other Pen
dulum, till it appear'd to keep the ſame
pace in its Vibrations, with that ſhut up in
the Receiver. Then having carefully
drawn away the Air, we did again ſet the
Pendulum in the Receiver a vibrating;
and giving the other Pendulum ſuch a mo
tion as made it deſcribe an Arch, accord
ing to ones gheſs, equal to that of the in
cluded Pendulum; we reckon'd, one of
us, the Recurſions of that Pendulum which
was ſwinging within the Receiver; and
another of us that which was moving in
(that which one would think a much more
reſiſting medinm) the Air. But once, one
of us reckon'd near two and twenty Re
curſions of the included Pendulum, whilſt
the other reckon'd but twenty of the Pen
dulum that vibrated without. And an
other time alſo, the former of theſe Pen-
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