4to, pp. 142, [1, Directions to the Binder], (pp. 39/41, 53/54 and 123-40 are ‘letterpress tables ... bound-in upon guards by the middle,’ numbered only with the odd numbers, pp. 131-34 misbound), with three engraved plates, one folding, and a folding engraved map; some foxing but a good copy; contemporary calf backed boards; rebacked; book-plate of Thomas Dundas of Upleatham, Yorkshire.
US $1194 €972
First separate edition of these papers, read at the Royal Society the previous year, by one of the outstanding surveyors of the eighteenth century. Roy’s principal aim is the correction of errors in the observations of Deluc, published in the Philosophical Transactions in 1771, and the work is a prime example of the painstaking accuracy of Roy’s measurements. The barometer depicted in the first plate is ‘Mr. Ramsden’s portable barometer.’ The map is a ‘Plan of the triangles made use of for obtaining the geometrical distance and altitude of Snowdon and Moel Eilio with respect to the sea at Carnarvon.’
See Taylor 402; not in NUC.
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