COOPER'S SLIDE RULE.
A slide rule by Keuffel and Esser made from plastic and lettered in black. The body is secured with metal end brackets and provides placement for sliding glass lenses. 12 x 2 inches and ¼ inch thick with original leather carrying case.
With GORDON COOPER'S signed provenance letter, reading in part: "I purchased this slide rule in 1949 for use at flight school then continued to use it during my Air Force and NASA careers. I printed my name very faintly on the out side and again on the inner flap of the stowage case."