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circular 4" General Industrial Co.
Object type: slide rule
Maker: Perrygraf Corporation
Place made: United States, Illinois, Maywood
Materials: cardboard; plastic
Measurements: .25 in x 4" diameter
Nomenclature: data processing tools and equipment - slide rules
Classification: tools and equipment
Circular slide rule with two scales, clear plastic cursor with red hairline. Marked on front: "General Industrial Slide Rule // General Industrial Co. 1788 Montroes, Chicago 13, Ill // LOngbeach 1-5871 // Slide-Chart Corp, 1959, PERRYGRAF Corp, Maywood, Ill." Instructions for use on reverse.
Gift of John Drisko