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maximum-minimum thermometer
maximum-minimum thermometer

maximum-minimum thermometer

Date1870-1890
Inventory Number1998-1-0832
ClassificationThermometer
Subject
    Maker American
    User Department of Physics, Harvard University ? founded 1884
    Cultural Region
      Place of Use
        Dimensions26 × 15.6 × 7.5 cm (10 1/4 × 6 1/8 × 2 15/16 in.)
        Material
          DescriptionA metal thermometer, mounted on a wooden base. The instrument consists of a bi-metal coil connected to an indicator which is positioned over a temperature scale. The expansion and contraction of the coil will result in the movement of the indictor over the scale.

          In addition to a pointer attached to the coil, it is set up so that the pointer pushes on two additional pointers attached to the base, for registering the minimum and maximum temperature.

          The scale is engraved in increments from 50 to 30 and is engraved,"Max. Min. / Centigrades"
          Signedunsigned
          Inscribedengraved on scale: Max. Min. / Centigrades
          FunctionThermometer. The metal strip is made of two different metals, which expand at different rates with a change in temperature. Hence the coil winds or unwinds a little, moving the pointer along. It also registers minimum and maximum temperature.
          ProvenanceTag "from Jeff Prep 3/12/67". From the Jefferson Physical Laboratory, Physics Department, Harvard.
          Historical AttributesThis maximum-minimum thermometer is in the style of one devised by Hermann & Pfister of Berne.
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          Date: 1850-1875
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          Percy Williams Bridgman
          Date: circa 1938
          Accessories: one bolt protector; one attachment; two large bolts, black and white photographs (C6-G1). Parts can be found in drawer B11-I8. Bridgman Press Manual (copy) in instrument file folder
          Object number: 1997-1-1819a
          Stirling-type hand microtome with bench clamp
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          James W. Queen & Company
          Date: circa 1890
          Object number: 1906