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Resistance Box (J.S. Plaskett)

University College

Brown insulator board composed of 20 brass plates, each row numbered 1-10 in descending order. Each plate is associated with a corresponding hold for brass pegs and a coil of resistant wire below the board, which are either bare metal or bright green (green coils are numbered sequentially on the bottom from 1-10). Two thick, removable brass pegs with brown insulator heads (only one pictured). Two brass knobs located at the top corners of the insulator board. Resistance coils encased in a plexiglass case with integral stand, not original to the piece.

Accession Number: 2009.uc.4

Alternative Name:

Primary Materials: Metal, Wood, Plexiglass


The Old Inventory Number is “uc4”; topmost brass plate stamped “108 J.S. Plaskett”; the Plexiglass case formerly had a label “3” on the bottom

Dimensions (cm): Height = 18.5, Width = 12, Length = 18


Used for producing desired electrical resistances in electrical experiments.


Associated Instruments:



J.S. Plaskett, Mechanician, Department of Physics

Date of Manufacture: 1890-1903


Additional Information and References:

Historical Notes:

J. S. Plaskett, professor at U of T. (not the instrument maker)