Leslie, Sir John (1766-1832) Short Biography – Leslie, Sir John (1766-1832) Sir John was a Professor of Natural Philosophy (as Science was known in those days) in the University of Edinburgh. In 1805 he obtained the chair of mathematics. Involved in experimental research, Sir John, in 1804, wrote Inquiry into Heat, and, in 1810, he “succeeded in freezing water under the air pump.” He invented such instruments as the differential thermometer, the hygrometer, the photometer, the pyroscope, the atmometer and the aethrioscope. Sir John travelled both on the continent and in America and, apparently, he had an interest in the frigid parts of our northern hemisphere.

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