Thermometers and hygrometers, 1744.
© Science Museum / Science & Society Picture Library
From 'A Course in Experimental Philosophy' (1744) by J T Desaguliers. A comparative chart of thermometer scales is also shown. John Theophilus Desaguliers (1683-1744), a French-born scientist and inventor, was chaplain and philosopher to Frederick, Prince of Wales. He wrote a series of lectures in natural philosophy, which were a runaway succes. Apparatus from the lectures was asembled in the King George III collection, now at the Science Museum, London.