Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              may happen to be betwixt the contigu­
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              ous ſurfaces of the internal parts of the
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              Stop-cock: And partly that it may be
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              the more eaſie to turn the Key (S) back­
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              wards and forwards. </s>
              <s>Pretty ſtore of oyl
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              muſt alſo be pour'd into the Cylindre,
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              both that the Sucker may ſlip up and
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              down in it the more ſmoothly and freely,
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              and that the Air might be the better
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              hindred from getting in between them:
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              And for the like reaſons, a little oyl is to
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              be uſed alſo about the Valve. </s>
              <s>Upon
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              which occaſion, it would not be omitted
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              (for it is ſtrange) that oftentimes, when
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              neither the pouring in of water, nor even
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              of oyl alone, prov'd capable to make the
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              Sucker move eaſily enough in the Cylin­
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              der; a mixture of both thoſe Liquors
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              would readily (ſometimes even to admi­
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              ration) perform the deſired effect. </s>
              <s>And
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              laſtly, the braſs cover of the Receiver,
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              being put into the braſs ring formerly de­
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              ſcrib'd, that no Air may get between
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              them, it will be very requiſite to plaiſter
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              over very carefully the upper edges of
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              both, with the plaiſter formerly mention­
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              ed, or ſome other as cloſe, which is to be
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              ſpread upon the edges with a hot Iron;
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              that being melted, it may run into and </s>
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