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Self-Inducting Coil with Handle

Unidentified · Physics

A short cylindrical coil set in a wooden frame with a wooden handle on one side. The cylindrical coil has a broader top and bottom with a narrower section between, like a hamburger patty between buns. This section is covered in a strip of red fabric. The coil has two metal terminals sitting on top of an insulated (bakelite?) plate on the uppermost wooden section. A wooden handle is attached by means of a metal bracket to the side of the cylinder.

Accession Number:

Alternative Name: Self-Inductor

Primary Materials:

Metal: Copper Alloy, Wood, Textile, Bakelite(?)


In between the metal terminals on the bakelite plate there is an inscription “J. Carpentier Ingr Constr Paris”, “1 Henry”, and “0514-1”.

Above the terminals, painted in white: “IIE”. Below the terminals, painted in blue: “L1”.

Written in black pen on the fabric wrapped around the coil: “AC[??]” “100Ω”

Engraved on the top of each terminal: “428”

Dimensions (cm):

Height = 7, diameter = 14.5, length = 27


This is a self-inducting circuit: a changing current in a circuit causes a magnetic field that induces a voltage in the same circuit. A “Henry” is a unit of inductance.


Good: The wood is scratched and nicked in places, and marked on the top by the handle with smudges of black, but is otherwise in good condition. The fabric covering of the coil is in good condition. The mtal components, including the terminals and brackets were enameled; the enamel is scratched and the metal underneath has dulled in places. At the base of the terminals and in the screws in the bakelite, there is furry white residue.

Associated Instruments:

Manufacturer: Jules Carpentier, Paris

Date of Manufacture: c. 1890-1900


University of Toronto Department of Physics

Additional Information and References:

A similar object is held by the Science Museum, Kensington, London.

Historical Notes:

  • Donated to UTSIC