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Original Callendar and Griffiths Resistance Bridge, 1850-1900

1850-1900

Improved Callendar and Griffiths Resistance Bridge, 1850-1900

1850-1900

Bulb of a Porcelain Air Thermometer, 1887

1887

Model of Callendar's Sunshine Receiver, 19th Century

1895-1910

Clinical surface thermometer

1886-1930

Clinical surface thermometer

1886-1930

Air Temperature Grid, 1902-1930

1902-1930

Air Temperature Grid, 1886-1930

1886-1930

Callendar's Disc 'Radio-Balance', 1905-1920

1905 (invented); 1907-1920

Cup and Thermopile for Callendar's Radio-Balance, 1886-1930

1886-1930

Frog's Heart Thermometer, 1887

1887

Callendar Electrical Temperature Indicator, 1894

1894

Original Cup Radio-Balance by H. L. Callendar, 1910

1910

Callendar's Original Radio Balance, 1905-1906

1905-1906

Callendar's Absolute Recording Bolometer, 1905

1905

Rectum Thermometer, 1886-1930

1886-1930

Clinical surface thermometer

1886-1930
Callendar's apparatus for determining the mechanical equivalent of heat with glass thermometer, by The Cambridge Scientific Instrument Company Limited, Cambridge, England, 1904.

Callendar's apparatus for determining the mechanical equivalent of heat with glass thermometer

1904
Temperature indicator, designed by Callendar and Griffiths, mounted on gimbals.

Temperature indicator

1900-1928
Car with experimental compressed air transmission. Made by Professor Hugh Longbourne Callendar in the Physics Department workshops at Imperial College, London. The car is based on a 1906 20hp Model F Stanley steam car. Professor Callendar installed a c1911 Swift, two-cylinder, petrol car engine where the boiler would have been on the original Stanley car. This petrol engine powered an air compressor, providing compressed air to power a 20hp Stanley steam car engine which drove the rear axle. The car is fitted with a Swift radiator and different hood so does not look like a standard Stanley steam car.

Motor car with experimental compressed air transmission

circa 1910
Original Callendar electrical temperature recorder (including integrator) in wooden case, 1897.

Callendar Temperature Recorder, 1897

1897
Air temperature grids, one of three, used by by Hugh Longbourne Callendar, England, 1886-1930.

Air Temperature Grid, 1886-1930

1886-1930
Callendar sunshine recorder, 1900 type, by Cambridge Scientific Instrument Co., 1914.

Callendar sunshine recorder

1914