Accession Number: 2009.ph.175


The rheostat consists of a flat piece of wood, on which is mounted a large central ring with an adjustable knob. Below the ring are three terminals with threaded caps, each with a wire running to the central ring. From the knob extends a metal clip, which runs across the top of the ring. A black circle on the wood block is marked in white “1 K”. A metal piece under the knob is marked in red “1 K(omega)”.

Alternative Name:

Primary Materials: Wood, Metal


In the top right corner of the wood block is written in white (paint?) the numeral “II” and the letter “E”.

Dimensions (cm): Height = 7.5, Width = 9, Length = 13.5


Used for testing varying resistance in electrical demonstrations or experiments.


Associated Instruments:

Manufacturer: General Radio (USA)

Date of Manufacture:

Provenance: Collection of Dr. Martin Lee.

Historical Notes: