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Polar Planimeter


A custom black case lined with purple velvet encased in a dark green cardboard box. The instrument is made of silver metal and black metal, as well as plastic for the dial and measuring wheel. All measurements are in cm. It has a main carriage and two arms, the tracer arm and the pole arm. The pole arm unit is an adjustable bar, with a pole at one end consisting of a weight with a needle point at the bottom. At the other end is a wheel which fits into a socket in the carriage. There is also a paper manual inside the green box.

Accession Number: 2011.psy.27

Alternative Name:

Primary Materials: metal; plastic, velvet


Manufacturer’s label taped to the velvet lining. “K+E KEUFFEL & ESSER CO. MADE IN GERMANY; 4242 1/2; Serial No. 1382”. This is also inscribed on the tracer arm.

Dimensions (cm): Height = 3, Width = 7, Length = 23


The Polar Planimeter is an instrument that accurately measures planar (2D) areas of any form.

Condition: Excellent

Associated Instruments:

Manufacturer: Keuffler & Esser Co, Germany

Date of Manufacture:


Dept. of Psychology, University of Toronto

Additional Information and References:

Historical Notes:

The object has three components: the green box, the black box and the instrument itself.