Account of a New Hygrometer. London: W. Bowyer and J. Nichols, 1774. Small 4to (222 x 175 mm). 57 pp, engraved folding plate by Basire. Contemporary marbled paper wrappers, housed in a blue morocco backed box. Spine perished, front wrapper hinge starting, light spotting. Provenance : Thomas Hornsby (1733-1810, presentation inscription by the author). AUTHOR'S PRESENTATION COPY of a rare offprint from the Philosophical Transactions of the Royal Society , detailing Deluc's invention to measure humidity. Deluc was a Swiss-born English geologist and meteorologist, who was made a fellow of the Royal Society in 1773. His hygrometer, detailed here, used an ivory bulb that when damp allowed mercury to move down a tube. Among his more noted discoveries was that the measurement of the quantity of aqueous vapor contained in any space was independent of the presence or density of the air. He was also the first to accurately measure height using a barometer.
Account of a New Hygrometer. London: W. Bowyer and J. Nichols, 1774. Small 4to (222 x 175 mm). 57 pp, engraved folding plate by Basire. Contemporary marbled paper wrappers, housed in a blue morocco backed box. Spine perished, front wrapper hinge starting, light spotting. Provenance : Thomas Hornsby (1733-1810, presentation inscription by the author). AUTHOR'S PRESENTATION COPY of a rare offprint from the Philosophical Transactions of the Royal Society , detailing Deluc's invention to measure humidity. Deluc was a Swiss-born English geologist and meteorologist, who was made a fellow of the Royal Society in 1773. His hygrometer, detailed here, used an ivory bulb that when damp allowed mercury to move down a tube. Among his more noted discoveries was that the measurement of the quantity of aqueous vapor contained in any space was independent of the presence or density of the air. He was also the first to accurately measure height using a barometer.
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