One of the books purchased recently for our rare book collections is Experiments and observations made in Britain, in order to obtain a rule for measuring heights with the barometer. The author was Colonel William Roy (1726-1790), surveyor and founder of the Ordnance Survey. The report was originally published in the Philosophical transactions of the Royal Society in 1777, but the copy we have bought was published separately by J. Nichols the following year.
The experiments described in the report were carried out in various locations, including Schiehallion in Scotland and Snowdon in Wales. As well as descriptions of the experiments, the book includes tables of the measurements and maps of the mountains where they were made. It provides important evidence of the contribution of north Wales to scientific developments in the eighteenth century.
Rare Books Librarian.
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