Resistance Box

University College

Accession Number: 2009.uc.6

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; two removable brass pegs with brown insulator head; two brass knobs located at the top corners of the insulator board;. resistance coils encased in a plexiglass case.

Alternative Name:

Primary Materials: metal, wood, plexiglass

Markings:

The topmost brass plate stamped “108 J.S. Plaskett”; one green coil has “DK” written on its bottom; the plexiglass case used to be labeled with a sticker that said “20” on the side.

Dimensions (cm): Height = 12, Width = 12.5, Length = 15

Function:

Used for producing desired electrical resistances in electrical experiments.

Condition:

Associated Instruments:

2009.uc.4: http://r1.chass.utoronto.ca/utmusi/display.php?instrument_id=427

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)