Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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letter ſuppoſing the gravity of the Aire)
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it will not be impertinent to determine
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more particularly then hitherto we have
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done, what gravity we aſcribe to it. </
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<
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>We tooke then an
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Æolipile
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made of
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copper, weighing ſix ounces, five drachms,
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and eight and forty graines: this being
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made as hot as we durſt make it, (for feare
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of melting the mettle, or at leaſt the So
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dar) was removed from the fire and im
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mediately ſtopped with hard wax that no
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Aire at all might get in at the little
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hole wont to be left in
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Æolipiles
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for the
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fumes to iſſue out at: Then the
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Æolipile
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being ſuffer'd leaſurely to coole was again
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weighed together with the wax that ſtopt
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it, and was found to weigh (by reaſon of
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the additionall weight of the wax) ſix
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ounces, ſixe drachmes, and 39 graines.
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>Laſtly, the wax being perforated without
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taking any of it out of the Scale, the
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externall Aire was ſuffered to ruſh in
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(which it did with ſome noyſe) and then
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the
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Æolipile
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and wax, being againe
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weighed amounted to ſix ounces, ſix
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drachmes, and 50. graines. </
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<
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>So that the
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Æolipile
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freed as farre as our fire could
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free it, from it's Aire, weighed leſſe then </
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