Archibald V Hill’s thermopile used to measure heat production, England, 1950-1960
1950-1960
Thermopile, with moving magnet galvanometer
Thermopile used to measure heat production, England, 1930-1940
1930-1940
Thermopile, on brass stand
1866-1896
Thermopile used to measure heat production, England, 1930-1940
1930-1940
Thermopile, ex Kew Observatory.
Thermopile
1929-1930
Thermopile
1925-1930
Thermopile
1930
Thermopile
1929-1930
Thermopile
1929-1930
Thermopile, ex Kew Observatory
Thermopile by Griffin and George Ltd.
1954-1974
Rubens' linear thermopile fitted with removable rectangular cone
1901-1926
Thermopile
1851-1950