Resistance Box

University College

Accession Number: 2009.uc.4

Description:

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.

Alternative Name:

Primary Materials: metal, wood, plexiglass

Markings:

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

Function:

Used for producing desired electrical resistances in electrical experiments.

Condition:

Associated Instruments:

2009.uc.6: http://r1.chass.utoronto.ca/utmusi/display.php?instrument_id=426

Manufacturer: J.S. Plaskett

Date of Manufacture: Late 19th C.

Provenance:

Historical Notes:

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