细节
A Fuller's circular slide-rule,
Type 1, with mahogany handle and case, brass mounting bracket, label of Stanley, Great Turnstile, 1907 instruction booklet in later leather binding and a booklet in purse for a Halden's Calculex slide-rule
Type 1, with mahogany handle and case, brass mounting bracket, label of Stanley, Great Turnstile, 1907 instruction booklet in later leather binding and a booklet in purse for a Halden's Calculex slide-rule