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Spherometer consists of a black-painted metal measuring disc and a ruler mounter on a tripod black-painted metal base. Measurements on ruler are metric, measurements on disc are imperial.

Accession Number:

Alternative Name:

Primary Materials: metal, painted metal


“W.G. PYE & Co. LTD ENGLAND CAMBRIDGE” is embossed on disc. “858 E” is written in black marker on top.

Dimensions (cm): 6.5x5x5


Use to determine the radius of curvature of concave and convex surfaces of mirrors and lenses.


Very good condition. Some minor flaking of paint and corrosion on painted base.

Associated Instruments:

Manufacturer: W.G. Pye & Company Limited

Date of Manufacture: Early to Mid-Twentieth Century


University of Toronto Physics Department.

Additional Information and References:

Historical Notes:

Object was received in a CENCO box with two additional spherometers (now numbered and and assorted other objects with uncertain relationships (now labelled