The Ever There Slide Rule- Casing and Manual Only
Accession Number: 2010.lej.18
Ironically, the Ever There slide rule was not there. A green cardboard case contains only the instruction manual. It once contained a 5″ Mannheim slide rule. The slide rule would have weighed no more than a fountain pen and had very little bulk. Instruction manual: K & E The Ever-There Slide Rule no. 4097D Simple Directions for Use. (copyright 1937, 1947)
Markings: Old Inventory Number = 18.
Dimensions (cm): N/A
Function: Facilitating calculations.
Manufacturer: Keuffel and Esser Co., New York
Date of Manufacture: c. 1936-1954