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switch
switch

switch

Datelate 19th-early 20th Century
Inventory Number1997-1-0259
ClassificationSwitch
Subject
    Maker H.T.P. Company
    Cultural Region
      Dimensions3.4 x 6.7 x 11.2 cm (1 5/16 x 2 5/8 x 4 7/16 in.)
      Material
        DescriptionSwitch consisting of two parallel knife-edge contacts attached to a large black handle. All rests on a white porcelain base.

        Signedatop base in center: H.T.P. CO / 125 V Underside of base: 677
        Inscribedon handle: 15 AMP. 125 V. on base: H.T.P. CO / 125 V. 677
        FunctionUsed to create and break an electrical circuit.
        switch
        switch
        American
        Date: late 19th-early 20th Century
        Object number: 1997-1-0258
        single pull double throw knife switch
        single pull double throw knife switch
        American
        Date: early 20th-mid 20th Century
        Object number: WJ0952
        switch part
        switch part
        American
        Date: late 19th-early 20th Century
        Object number: 1998-1-0685
        rotating reversing switch, D.P.D.T.
        rotating reversing switch, D.P.D.T.
        American
        Date: late 19th-early 20th Century
        Object number: 0381
        Green wooden box containing knife and rotary switches
        Green wooden box containing knife and rotary switches
        Date: 1890-1930
        Object number: RS0179
        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
        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
        reversing switch, D.P.D.T.
        reversing switch, D.P.D.T.
        American
        Date: late 19th-early 20th Century
        Object number: 0378
        bridge testing switch
        bridge testing switch
        Leeds & Northrup Company
        Date: late 19th-early 20th Century
        Accessories:
        Object number: 0283
        rotor and brush switch
        rotor and brush switch
        Harvard Engineering School
        Date: early 20th Century
        Object number: 0382
        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