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Unidentified · Physics

Rotating circular glass lens enclosed within a metal inner frame which is further enclosed in wooden frame. Protruding from the inner metal frame is a metal and wooden crank. In the middle of the lens are two yellow-green glass pieces, one of which rotates with the turning of the crank.

Accession Number:

Alternative Name:

Primary Materials: metal, wood, glass

Markings: “49”

Dimensions (cm): 2x10x22 cm

Function: Unknown


Good, some wear and scratches throughout. Glass is cracked and chipped and adhesive is visible around the edges of the one side. Reverse of metal frame is missing one screw. Some rust on connecting component of wood and crank shaft. Wood is split in area between crank and metal frame.

Associated Instruments:

Manufacturer: Unknown

Date of Manufacture: Unknown


University of Toronto Department of Physics.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC