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black bulb thermometer
black bulb thermometer

black bulb thermometer

Datecirca 1900
Inventory Number1998-1-1251
ClassificationThermometer
Subject
    Maker Henry J. Green fl. 1885 - 1910
    User Oak Ridge Station 1931 - 2005
    User George R. Agassiz Station, Harvard 1951 - 1982
    User Harvard College Observatory founded 1839
    Cultural Region
      Place of Origin
        Place of Use
          Dimensions43 x 6 x 19 cm (16 15/16 x 2 3/8 x 7 1/2 in.)
          Material
            DescriptionA thermometer consisting of a thin glass tube with a capillary that has a scale in Fahrenheit degrees (0-210). Its mercury bulb is painted completely black and is in the shape of a sphere at the end of a cylindrical stem. The whole thermometer is kept inside a clear glass vessel with a large spherical bulb surrounding the thermometer's mercury bulb such that it is exactly at its center.
            Signedon stem opposite scale: H.J. Green, Brooklyn, N.Y. 2455
            FunctionThis is a thermometer for determining the amount of heat radiation (infrared light) in the environment at a certain moment. Its mercury bulb is isolated from contact with the ambient temperature by an evacuated glass vessel, and it is painted completely black so it will absorb the maximum possible heat radiation.

            Heat radiation is an important meteorological reading as an indication of cloudiness and contributes to the subjective perception of ambient temperature in addition to the temperature of air.
            ProvenanceTransferred to CHSI, From the Agassiz Station, Harvard College Observatory, Harvard, Mass.
            black bulb thermometer
            black bulb thermometer
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-1291
            black bulb thermometer
            black bulb thermometer
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-1261
            black bulb thermometer
            black bulb thermometer
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-1250
            black bulb thermometer
            black bulb thermometer
            James J. Hicks
            Date: 1880-1900
            Object number: 1998-1-1273
            minimum thermometer
            minimum thermometer
            Henry J. Green
            Date: 1890-1910
            Accessories: cardboard box
            Object number: 1998-1-1271b
            maximum thermometer
            maximum thermometer
            Henry J. Green
            Date: 1890-1910
            Accessories: cardboard box
            Object number: 1998-1-1271a
            minimum thermometer
            minimum thermometer
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-1255
            meteorological thermometer
            meteorological thermometer
            Henry J. Green
            Date: 1885-1910
            Object number: DW0631
            thermometer
            thermometer
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-1256
            pair of maximum and minimum thermometers
            pair of maximum and minimum thermometers
            Henry J. Green
            Date: circa 1920
            Object number: DW0632
            maximum thermometer
            maximum thermometer
            Henry J. Green
            Date: 1885-1910
            Object number: 1998-1-1286
            two thermometers in wooden case
            two thermometers in wooden case
            Henry J. Green
            Date: 1890-1910
            Object number: 1998-1-0621