A 5″ metal slide rule. The material seems to be common sheet metal which is shiny on the inside but has a gray matte surface for the scales. It is a closed frame slide rule incorporating a mechanical calculator for addition and subtraction to six significant figures on the back surface. A stylus for the addition and subtraction functions is provided and can be attached to the side. Scales: The back surface of the slide rule has inch and centimeter measuring scales. The scales, which are all folded are A, B, C1, C and D.
Accession Number: 2010.lej.22
Primary Materials: Metal
Markings: Old Inventory Number = 22.
Dimensions (cm): Height = .9, Width = 4.2, Length = 16.2
Function: For facilitating calculations.
Condition: Item is in very good condition.
Manufacturer: Alco, Japan
Date of Manufacture: c. 1920-1970
Additional Information and References: