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

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              <s>
                <pb xlink:href="013/01/162.jpg" pagenum="132"/>
              found by our ſeveral marks whereby we
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              had taken notice of its ſeveral removes, that
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              it had
                <expan abbr="deſcẽded">deſcended</expan>
              about (9/16) of an Inch from the
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              place where it firſt ſetled, & the other Inch
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              and (7/16) it had aſcended. </s>
              <s>And it ſeems pro­
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              bable that the height of the Mercurial Cy­
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              linder would have varied yet more, if the
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              Experiment had been made in the open
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              Air and in a long Tube, where the Parti­
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              cles of the Impriſon'd Air, by having
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              more room to diſplay themſelves in,
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              might not have had ſo ſtrong a Spring to
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              work upon the Quick-ſilver with. </s>
              <s>But for
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              want both of time and of a competent
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              quantity of Mercury (which was not to be
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              procur'd where we then happen'd to be)
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              we were unable to make any further try­
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              als: which therefore chiefly troubled us,
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              becauſe we would gladly have try'd an in­
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              genious Experiment which was ſuggeſted
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              unto us by that excellent Mathematician
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              Mr.
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              Wren,
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              who being invited to name any
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              thing he would have us try touching the
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              preſſure of the Air, deſired us to obſerve
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              whether or no the Quick-ſilver in a long
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              Tube would not a little vary its height ac­
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              cording to the Tides, eſpecially about the
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              New and Full Moon, about which times
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              Mariners obſerve thoſe great Flowings
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              and Ebbs of the Sea, that they call the </s>
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        </body>
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