Your choice of vintage slide ruler, used for mathematical calculations before electronic calculators were widely available.
Wooden-framed ruler is made by Keuffel + Esser (NY), dated to 1925. Great condition for 100 years old, with some breakage to wood at one end, as shown. Dimensions: 10.5” long x 1.25” wide.
Metal ruler is made by Pickett and Eckel (Chicago), dated to 1962 Great condition, with one small screw missing, as shown. Does not impact structure or functionality. This model was carried on the first five Apollo missions. Dimensions: 6” long x 1.5” wide.
Your choice of vintage slide ruler, used for mathematical calculations before electronic calculators were widely available.
Wooden-framed ruler is made by Keuffel + Esser (NY), dated to 1925. Great condition for 100 years old, with some breakage to wood at one end, as shown. Dimensions: 10.5” long x 1.25” wide.
Metal ruler is made by Pickett and Eckel (Chicago), dated to 1962 Great condition, with one small screw missing, as shown. Does not impact structure or functionality. This model was carried on the first five Apollo missions. Dimensions: 6” long x 1.5” wide.
