Thermopile used to measure heat production, England, 1930-1940
Thermopiles are scientific instruments used to measure small changes in heat. These were used by Archibald V Hill (1886-1977), a British physiologist studying the heat produced by nerves and muscles when they are stimulated. The heat produced is converted to electricity by a series of thermocouples (the two coils of metal which when heated produce an electric current) and recorded using a galvanometer. Hill studied heat and energy exchanges from the 1910s onwards, discovering that heat is produced by nerves and becoming one of the founders of the field of biophysics in the process. The thermopile is shown here with two similar examples (1989-158 and 1989-162).
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An instrument of extreme sensibility, used to determine slight differences and degrees of heat