Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              to divers ingenious perſons has at firſt
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              ſight ſeem'd very wonderful. </s>
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              <s>THe thing that is wont to be admired,
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              and which may paſs for our ſecond
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              Experiment is this, That if, when the
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              Receiver is almoſt empty, a By-ſtander
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              be deſired to lift up the braſs Key (former­
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              ly deſcribed as a ſtopple in the braſs Co­
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              ver) he will finde it a very difficult thing
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              to do ſo, if the Veſſel be well exhauſted;
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              and even when but a moderate quantity of
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              Air has been drawn out, he will, when he
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              has lifted it up a little, ſo that it is ſome­
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              what looſe from the ſides of the lip or
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              ſocket, which (with the help of a little
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              oyl) it exactly filled before, he will (I ſay)
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              finde it ſo difficult to be lifted up, that
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              he will imagine there is ſome great weight
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              faſtned to the bottom of it. </s>
              <s>And if (as
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              ſometimes has been done for merriment)
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              onely a Bladder be tyed to it, it is plea­
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              ſant to ſee how men will marvail that ſo
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              light a Body, filled at moſt but with Air,
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              ſhould ſo forcibly draw down their hand
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              as if it were fill'd with ſome very ponder­
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              ous thing: whereas the cauſe of this pret­
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              ty
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              Phænomenon
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              ſeems plainly enough to </s>
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