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Ritchie's Radiation and Absorption Apparatus, 1851-1900

Ritchie's Radiation and Absorption Apparatus, 1851-1900

1871-1989
Domestic Vacuum Flask, 1945-1955

Domestic Vacuum Flask, 1945-1955

1945-1955
Differential Air Thermometer, 1894

Differential Air Thermometer, 1894

1894
Replica of Early Dewar Heat Insulation Vessel, 1932

Replica of Early Dewar Heat Insulation Vessel, 1932

1932
Fire Syringe Demonstration Apparatus, 1894

Fire Syringe Demonstration Apparatus, 1894

1894
Replica of a Dewar Metal Vacuum Vessel, 1931

Replica of a Dewar Metal Vacuum Vessel, 1931

1931
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Replica of Vacuum Vessel Sealed with Wax, 1930

Replica of Vacuum Vessel Sealed with Wax, 1930

1930
Dewar Vacuum Vessel with Charcoal, 1906-1914

Dewar Vacuum Vessel with Charcoal, 1906-1914

1906-1914
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Convection Mill Physics Apparatus, 1919-1928

Convection Mill Physics Apparatus, 1919-1928

1919-1928
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1877

Crookes' Radiometer, 1877

1877
Replica of Early Vacuum Flask with Glass Seals, 1930

Replica of Early Vacuum Flask with Glass Seals, 1930

1930
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1877

Crookes' Radiometer, 1877

1877
Vacuum Cup, 1877-1900

Vacuum Cup, 1877-1900

1877-1900
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1878

Crookes' Radiometer, 1878

1878
Dewar Vacuum Vessel, 1877-1900

Dewar Vacuum Vessel, 1877-1900

1877-1900
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Crookes' Radiometer, 1876

Crookes' Radiometer, 1876

1876
Vacuum Cup, 1877-1900

Vacuum Cup, 1877-1900

1877-1900
Vacuum Unit from Sir James Dewar's Research Vacuum Apparatus, 1877-1900

Vacuum Unit from Sir James Dewar's Research Vacuum Apparatus, 1877-1900

1900-1982
Replica of Vacuum Vessel with Mercury Trough, 1930

Replica of Vacuum Vessel with Mercury Trough, 1930

1930
Crookes' Radiometer, 1872-1879

Crookes' Radiometer, 1872-1879

1872-1879
Invar rod no. 8858, 45-inches long and 8 mm diameter, with N.P.L. certificate dated 7th May 1912 (mean coefficient of linear dilatation between the temperatures 0.6°C and 30°C is 0.0000000 per 1°C).

Invar Rod, 1900-1912

1900-1912
Boy's apparatus for determining the mechanical equivalent of heat by The Cambridge Scientific Instrument Company, Cambridge, England, 1884. From The Physical Laboratory of the Science and Arts Department, South Kensington.

Boy's Mechanical Equivalent of Heat Apparatus, 1884

1884
Replica of glass object in Royal Institution collection: Dewar double annular jacketed vessel completed by Scientific Supplies Co. Ltd. and Museum Workshops, London, England, 1932.

Replica of Dewar Double-Annular Jacketed Vessel, 1932

1932
Radiometer used to illustrate Sir William Crookes' researches on the radiation of heat in high vacua: pith-ball balance in air (the balls are attracted if a flame is brought near), 1872-79.

Crookes' Radiometer, 1872-79

1872-1879
Radiometer used to illustrate Sir William Crookes' researches on the radiation of heat in high vacua: radiometer with semi-cylindrical vanes, 1872-79.

Crookes' Radiometer, 1872-1879

1872-1879
Thermal conductivity apparatus for thin discs of insulating materials, designed and built at the National Physical Laboratory, England, 1923.

Apparatus for Measuring the Thermal Conductivity of a Poor Conductor, 1923

1923
Callendar's apparatus for determining the mechanical equivalent of heat with glass mercury thermometer, by The Cambridge Scientific Instrument Co. Ltd., Cambridge, England, 1904.

Callendar's Mechanical Equivalent of Heat Apparatus, 1904

1904
Remains of original belt for Callendar's apparatus for determining the mechanical equivalent of heat, by The Cambridge Scientific Instrument Company Limited, Cambridge, England, 1904.

Remains of original belt for Callendar's apparatus

1904
Accessories for Melloni's apparatus, by Elliott Bros., London, England, 1888. Consisting of leslie cube, spirit burner and wood, rock salt plates, four mica polarising plates, line thermopile containing antimony (toxic), three screens and extra oil lamp covers.

Melloni's Apparatus, 1888

1888
Cast iron bed fitted with equipment for Melloni's apparatus by Elliott Bros., London, England, 1888. The bed is fitted with three sliding uprights and one upright with radial arm. The radial arm is fitted with a counterweight, two sliding pillars topped with a wooden bed and a vertical black mirror, and a central fixed pillar topped with a thermopile with double cone and with two caps.

Melloni's Apparatus, 1888

1888