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spring knife switch
spring knife switch

spring knife switch

Datelate 19th-early 20th Century
Inventory Number0517
ClassificationSwitch
Subject
    Maker American
    Cultural Region
      Dimensions12.6 × 12.7 × 21.5 cm (4 15/16 × 5 × 8 7/16 in.)
      Material
        DescriptionCast iron frame with arm supporting copper leaf contacts which close between brass lugs screwed to wooden board. A spring accelerates the opening when released by handle.
        Signedunsigned
        Inscribedtagged on side of base: 517 On handle: PAT. FEB 25, '89
        FunctionUsed to create and break an electrical circuit. For heavy current D.C.
        Historical Attributes2/25/1888
        switch
        switch
        American
        Date: late 19th-early 20th Century
        Object number: 1998-1-0689
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        Date: 1900-1915
        Object number: 0324
        chemistry set
        chemistry set
        A. C. Gilbert Company
        Date: 1936
        Object number: 2010-1-0010
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        reversing switch with silver contacts, D.P.D.T.
        American
        Date: late 19th-early 20th Century
        Object number: 0390
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        rotor and brush switch
        Harvard Engineering School
        Date: early 20th Century
        Object number: 0382
        Gilbert No. 5 chemistry set
        Gilbert No. 5 chemistry set
        A. C. Gilbert Company
        Date: 1954
        Object number: 2010-1-0011
        reversing switch with mercury contacts for bridge work, D.P.D.T.
        reversing switch with mercury contacts for bridge work, D.P.D.T.
        American
        Date: late 19th-early 20th Century
        Accessories: tilting arm (0380b)
        Object number: 0380a
        tilting arm with six contacts for reversing switch
        tilting arm with six contacts for reversing switch
        American
        Date: late 19th-early 20th Century
        Accessories: goes with reversing switch (0380a)
        Object number: 0380b
        reversing switch, D.P.D.T.
        reversing switch, D.P.D.T.
        American
        Date: late 19th-early 20th Century
        Object number: 0378
        mercury contact switch for bridge work, D.P.D.T.
        mercury contact switch for bridge work, D.P.D.T.
        Date: late 19th-early 20th Century
        Object number: 0379
        Green wooden storage box containing 113 sockets, plugs, and fuses
        Green wooden storage box containing 113 sockets, plugs, and fuses
        Date: 1890-1930
        Object number: RS0505
        key-operated switch, S.P.D.T., for electrometer
        key-operated switch, S.P.D.T., for electrometer
        Fritz Köhler
        Date: late 19th-early 20th Century
        Object number: 0384