Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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produc'd upon tryals purpoſely made
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to examine the validity of the conjectures,
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other tryals had ſuggeſted. </
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>Firſt then we obſerv'd, that the Appa
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rition of Light may be made as well by
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Candle-light, as by Day-light; and in
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whatever poſition the Candle be held, in
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reference to the Receiver, as on this or
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that hand of it, above it, beneath it, or
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any other way, provided the Beams of
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Light be not hinder'd from falling upon
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the Veſſel. </
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>Next, we noted that the flaſh appears
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immediately upon the turning of the
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Key, to let the Air out of the Receiver
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into the empty'd Cylinder, in ſo much
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that I remember not that when at any
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time in our great Receiver, the Stop-cock
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was open'd before the Cylinder was ex
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hauſted (whereby it came to paſs that the
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Air did rather deſcend, then ruſh into the
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Cylinder) the often mention'd flaſh ap
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pear'd to our eyes. </
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>Yet, we further obſerv'd, that when in
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ſtead of the great Receiver we made uſe
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of a ſmall Glaſs, not containing above a
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pound and a half of Water, the
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Phæno
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menon
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might be exhibited though the
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Stop-cock were open, provided the </
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