Thermopile

1929-1930

Thermopile

1925-1930

Thermopile

1930

Thermopile, ex Kew Observatory.

Thermopile, on brass stand

1866-1896

Thermopile used to measure heat production, England, 1930-1940

1930-1940

Archibald V Hill’s thermopile used to measure heat production, England, 1950-1960

1950-1960

Thermopile, ex Kew Observatory

Thermopile

1929-1930

Thermopile

1929-1930

Thermopile, with moving magnet galvanometer

Thermopile used to measure heat production, England, 1930-1940

1930-1940

Thermopile

1851-1950

Thermopile by Griffin and George Ltd.

1954-1974

Rubens' linear thermopile fitted with removable rectangular cone

1901-1926