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

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1but that they moved ſome of them up­
wards, as well as ſome of them down­
wards, and ſome of them ſide-ways, as
they are wont to do, when upon ſuch col­
liſions they fly out in the open Air.
Experi­
ment 14.
We likewiſe cauſ'd a piece of Steel to
be made of the form and bigneſs of the
Flint, in whoſe place we put it, and then
the Piſtol being cock'd and conveyed in­
to the Receiver, the Trigger was pull'd
after the Air was drawn out: And though
the place were purpoſely ſomewhat dar­
ken'd, yet there appear'd not upon the
ſtriking of the two Steels againſt each o­
ther the leaſt ſpark of Fire: Nor did we
expect any (having before in vain attem­
pted to ſtrike Fire this way in the open
Air) though we thought fit to make the
Experiment to undeceive thoſe who fan­
cy in rarified Air, I know not what ſtrange
diſpoſition, to take Fire upon a much
ſlighter occaſion then this Experiment
afforded.
We have indeed found, that
by the dextrous Colliſion of two har­
den'd pieces of Steel, ſtore of ſparks
may be ſtruck out: But that was done with
ſuch vehement percuſſion of the edges of
the two Steels, as could not well be com­
paſſ'd in our Receiver.

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