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inductance standard
inductance standard

inductance standard

Datecirca 1920
Inventory Number0482
ClassificationInductance Coil
Subject
    Maker American ?
    User Department of Physics, Harvard University founded 1884
    Cultural Region
      Place of Origin
        Place of Use
          Dimensions33.7 × 32.9 × 28.7 cm (13 1/4 × 12 15/16 × 11 5/16 in.)
          Material
            DescriptionFrom Instrument Card: "Inductance Standard...Identical to 481. A variable inductance of two coils wound as D's in two Bakelite discs. One rotates past the other 1.2 turn 180 degrees. Both are held in place by a hard rubber brace, and mounted vertically on a wooden board."
            Signedunsigned
            Inscribedon wood base: B [object 0481 is marked A]
            Curatorial RemarksIdentical to 0481 (description from original card).
            FunctionInducatance Standard. One can vary the angle between the two D-shaped coils, which alters the inductance.

            Used for physics teaching.
            ProvenanceFrom the Physics Department, Harvard University. Was stored in the Cruft Attic Antique Closet. 1/13/65.
            Historical AttributesFrom card: "Probably made in the Cruft or Jefferson shops."
            inductance standard
            inductance standard
            Department of Physics, Harvard University
            Date: circa 1920
            Object number: 0481
            inductance coil
            inductance coil
            American
            Date: 1900-1930
            Object number: 1997-1-0151
            variable inductance
            variable inductance
            George Washington Pierce
            Date: circa 1905
            Object number: 0520
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            standard of self-inductance coil
            Nalder Brothers & Company
            Date: 1885-1925
            Object number: 0331
            variable inductance
            variable inductance
            American
            Date: circa 1890
            Object number: 0497
            LC resonant circuit with condensers and variable inductance
            LC resonant circuit with condensers and variable inductance
            Wireless Specialty Apparatus Company
            Date: circa 1908
            Accessories: copper-plated glass cylinders (0507b and 0507c)
            Object number: 0507a
            standard inductance, 10 mH 106J
            standard inductance, 10 mH 106J
            General Radio Company
            Date: early 20th Century
            Object number: RS0254
            standard inductance 106G
            standard inductance 106G
            General Radio Company
            Date: early 20th Century
            Object number: RS0255
            Green wooden storage box containing various coils and variometers
            Green wooden storage box containing various coils and variometers
            Date: 1890-1930
            Object number: RS0508
            inductance standard
            inductance standard
            Department of Physics, Harvard University
            Date: circa 1915
            Object number: 0479
            Inductance - Fixed Standard, General Radio, Type 106 K
            Inductance - Fixed Standard, General Radio, Type 106 K
            General Radio Company
            Object number: RS0647
            Inductance - Fixed Standard, General Radio Co., Type 106 G
            Inductance - Fixed Standard, General Radio Co., Type 106 G
            General Radio Company
            Object number: RS0648