1produc'd upon tryals purpoſely made
to examine the validity of the conjectures,
other tryals had ſuggeſted.
to examine the validity of the conjectures,
other tryals had ſuggeſted.
Firſt then we obſerv'd, that the Appa
rition of Light may be made as well by
Candle-light, as by Day-light; and in
whatever poſition the Candle be held, in
reference to the Receiver, as on this or
that hand of it, above it, beneath it, or
any other way, provided the Beams of
Light be not hinder'd from falling upon
the Veſſel.
rition of Light may be made as well by
Candle-light, as by Day-light; and in
whatever poſition the Candle be held, in
reference to the Receiver, as on this or
that hand of it, above it, beneath it, or
any other way, provided the Beams of
Light be not hinder'd from falling upon
the Veſſel.
Next, we noted that the flaſh appears
immediately upon the turning of the
Key, to let the Air out of the Receiver
into the empty'd Cylinder, in ſo much
that I remember not that when at any
time in our great Receiver, the Stop-cock
was open'd before the Cylinder was ex
hauſted (whereby it came to paſs that the
Air did rather deſcend, then ruſh into the
Cylinder) the often mention'd flaſh ap
pear'd to our eyes.
immediately upon the turning of the
Key, to let the Air out of the Receiver
into the empty'd Cylinder, in ſo much
that I remember not that when at any
time in our great Receiver, the Stop-cock
was open'd before the Cylinder was ex
hauſted (whereby it came to paſs that the
Air did rather deſcend, then ruſh into the
Cylinder) the often mention'd flaſh ap
pear'd to our eyes.
Yet, we further obſerv'd, that when in
ſtead of the great Receiver we made uſe
of a ſmall Glaſs, not containing above a
pound and a half of Water, the Phæno
menon might be exhibited though the
Stop-cock were open, provided the
ſtead of the great Receiver we made uſe
of a ſmall Glaſs, not containing above a
pound and a half of Water, the Phæno
menon might be exhibited though the
Stop-cock were open, provided the