Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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1the force of his hand would then no lon­
ger bend thoſe numerous ſpringy Body's
that compoſe the Fleece, yet they would
continue as ſtrongly bent as before, be­
cauſe the Box they are incloſ'd in would
as much reſiſt their re-expanding of
themſelves, as did the hand that put them
in.
For thus we may conceive, that the
Air being ſhut up, when its parts are bent
by the whole weight of the incumbent
Atmoſphere, though that weight can no
longer lean upon it, by reaſon it is kept
off by the Glaſs, yet the Corpuſcles of
the Air within that Glaſs continue as
forcibly bent as they were before their in­
cluſion, becauſe the ſides of the Glaſs
hinder them from diſplaying or ſtretch­
ing out themſelves.
And if it be ob­
jected that this is unlikely, becauſe ev'n
Glaſs bubles, ſuch as are wont to be
blown at the flame of a Lamp, exceeding
thin and Hermetically ſeal'd will not
break; whereas it cannot be imagin'd
that ſo thin a Priſon of Glaſs could re­
ſiſt the Elaſtical force of all the included
Air, if that Air were ſo compreſſ'd as we
ſuppoſe.
It may be eaſily reply'd, That
the preſſure of the inward Air againſt the
Glaſs, is countervail'd by the equal preſ-

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