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III. Description of a Mercurial Level*

Published online by Cambridge University Press:  17 January 2013

Alexander Keith Esq.
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Extract

Figure I. is a section of the instrument formed of mahogany or boxwood. A A are two oblong square cavities connected together by a narrow close channel, running from the bottom of the one to the other. B B are two grooves hollowed out of the wood, in order to contain the fights, &c. They are shut up by a lid, which turns upon a screw-nail at the centre C, as may be seen more distinctly from fig. 4.

Type
Papers Read Before the Society
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 2 , Issue 2 , 1790 , pp. 14 - 16
Copyright
Copyright © Royal Society of Edinburgh 1790

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References

* This Paper was read before the Philosophical Society of Edinburgh in December 1778; and is now printed by order of the Committee for publication of the Transactions of the Royal Society of Edinburgh.