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contactor switch
contactor switch

contactor switch

Datelate 19th-early 20th Century
Inventory Number0337
ClassificationSwitch
Subject
    Maker American ?
    User Department of Chemistry, Harvard University founded 1791
    Cultural Region
      Place of Use
        Dimensions15.4 × 29.2 × 19.7 cm (6 1/16 × 11 1/2 × 7 3/4 in.)
        Material
          DescriptionA pair of electromagnet spools and see-saw armature, on spring pivot, carrying two contactors. These dip into respective mercury cups, one to operate armature and the other for external breaker use. Each has a barrel on cylindrical reversing switch in respective circuits. All mounted on rectangular mahogany base. Adjustments provide for timing armature over small range.

          Glass cup and spring pivot broken.

          0337a base with electromagnetic coils
          0337b glass mercury cup
          0337c glass mercury cup
          0337d rocking armature
          Signedunsigned
          FunctionFor making and breaking circuits at slow speeds and reversing currents.
          ProvenanceFrom Harvard University Chemistry Department.
          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
          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
          reversing switch, or electrepeter
          reversing switch, or electrepeter
          Daniel Davis, Jr.
          Date: circa 1842
          Object number: 0137
          reversing switch, or electrepeter
          reversing switch, or electrepeter
          Daniel Davis, Jr.
          Date: circa 1842
          Object number: 0138
          Clarke electric generator model
          Clarke electric generator model
          Laboratoire de Physique, Faculté Libre de Lille
          Date: circa 1890
          Object number: DW0078
          Holtz electrostatic machine with opposite rotating plates
          Holtz electrostatic machine with opposite rotating plates
          Date: circa 1830
          Object number: DW0003
          electromagnetic tuning fork
          electromagnetic tuning fork
          Rudolph Koenig
          Date: circa 1889
          Object number: 1997-1-0882
          reciprocating armature electromagnetic engine model
          reciprocating armature electromagnetic engine model
          Palmer and Hall
          Date: circa 1855
          Object number: 0139
          crescent sundial
          crescent sundial
          Johann Martin
          Date: 1670-1700
          Object number: 7116
          upright reciprocating engine model
          upright reciprocating engine model
          Daniel Davis, Jr.
          Date: circa 1842
          Object number: 0140
          electromagnetic rotation bar
          electromagnetic rotation bar
          Breton Frères
          Date: 1850-1890
          Accessories: foot broken off
          Object number: DW0392