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III. Description of a Mercurial Level*

Published online by Cambridge University Press:  17 January 2013

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
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.