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Signature	Maker	Instruments	Comments	Location	References
LESLIE, JOHN	Scotland, 1766-1832, PHIM	Hygrometer and Differential Thermometer, Photometer = Royal Observatory of Scotland Sale, 6/19/1848.	Sir John Leslie; invented barometric scale to compute heights of mountains; invented the differential thermometer; F.R.S.; author; Professor of Mathematics, Edinburgh U., 1805-; instruments have platina scales.	Edinburgh.	Middleton 4; Taylor 2(863); USNM; G.L'E. Turner 24; Gunther 2; Chaldecott 3; RGO; RSW.
LESLIE, JOHN	Scotland, 1766-1832, PHIM	Hygrometer and Differential Thermometer, Photometer = Royal Observatory of Scotland Sale, 6/19/1848.	Sir John Leslie; invented barometric scale to compute heights of mountains; invented the differential thermometer; F.R.S.; author; Professor of Mathematics, Edinburgh U., 1805-; instruments have platina scales.	Edinburgh.	Middleton 4; Taylor 2(863); USNM; G.L'E. Turner 24; Gunther 2; Chaldecott 3; RGO; RSW.

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