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resistance box 40,000 Ohms
resistance box 40,000 Ohms

resistance box 40,000 Ohms

Date1910-1930
Inventory Number0291a-c
ClassificationResistance Box
Subject
    Maker Leeds & Northrup Company 1903 - 1995
    Cultural Region
      Place of Origin
        Dimensions17.5 × 16.5 × 16.5 cm (6 7/8 × 6 1/2 × 6 1/2 in.)
        Material
          Accessoriessix plugs
          DescriptionResistance box consisting of eight internal resistance coils and six tall plug contacts in the form of a circle with binding posts on a metal circular base. There are also two empty holes in the circular base for two more plug contacts. Eight metal knobs protrude laterally from the circular base, corresponding to values on the dial.

          These are mounted on a square hard rubber platform, which in turn rests on a square wooden case.
          Signedtop marked: The Leeds & Northrup Co. Philadelphia 17024
          Inscribeddial marked: Res. - 10 ohms, inf.- 20 ohms, inf.- 30 ohms, inf. - 40 ohms, 1000's [ohms]. marked: Harvard University 726 scratched on bottom: PROPERTY OF HARVARD ENGINEERING SCHOOL in pencil on bottom: 4246
          Curatorial RemarksWas first incorrectly catalogued as 1997-1-0176, so slide shows it with that number.
          FunctionSuch an instrument is used to measure the resistance of electric conductors. For a short general description and other images, go to the following website.
          ProvenanceFrom the Harvard University Engineering School.
          resistance box
          resistance box
          Leeds & Northrup Company
          Date: 1910-1930
          Accessories: plugs (8)
          Object number: 1997-1-0184
          resistance box
          resistance box
          Leeds & Northrup Company
          Date: 1910-1930
          Accessories: plugs (12)
          Object number: 1997-1-0186
          decade plug resistance box
          decade plug resistance box
          Leeds & Northrup Company
          Date: circa 1938
          Accessories: plugs (6)
          Object number: 1997-1-0196
          resistance box
          resistance box
          Leeds & Northrup Company
          Date: 1910-1930
          Accessories: plugs (12)
          Object number: 1997-1-0185
          decade resistance box
          decade resistance box
          Leeds & Northrup Company
          Date: circa 1930
          Object number: 0578
          resistance box
          resistance box
          Leeds & Northrup Company
          Date: 1910-1930
          Accessories: plugs (5)
          Object number: 2003-1-0035
          resistance box
          resistance box
          American
          Date: 1890-1920
          Accessories: plugs (9)
          Object number: 0363a-k
          resistance box 1111 ohms
          resistance box 1111 ohms
          L. G. Tillotson & Company
          Date: circa 1880
          Accessories: plugs (8)
          Object number: DW0064
          resistance box
          resistance box
          Leeds & Northrup Company
          Date: circa 1940
          Object number: 0579
          resistance box
          resistance box
          American
          Date: circa 1910
          Accessories: plugs (13)
          Object number: 1997-1-0118
          resistance standard (2 ohms)
          resistance standard (2 ohms)
          Leeds & Northrup Company
          Date: 1935-1936
          Accessories: storage box
          Object number: 1997-1-0227a
          resistance standard (2 ohms)
          resistance standard (2 ohms)
          Leeds & Northrup Company
          Date: 1935-1936
          Accessories: storage box
          Object number: 1997-1-0227e