Artifact Details Title Circular slide rule Catalog Number 102627852 Type Physical object Description Elementary circular slide rule mounted on a rectangualr plastic card - an advertising give-away. Instructions for multiplication and division printed on the circular rotating scale. "For Armament Preparedness" printed on front. Manufacturer American Ordnance Association Dimensions overall: 1/8 in x 2 1/2 in x 4 in Category Pre-computer/slide rule