细节
A Cashmore's proportion calculator,
by Bellingham & Stanley, 71 Hornsey Rise. No., the steel arms stamped with scales, two magnifiers and adjusters, triangular on shaped mahogany base with cover, 24½in. (62.2cm.) wide; and an Everard-pattern two-slider boxwood slide rule, 12in. (30.5cm.) long
See illustration (part lot) (2)
by Bellingham & Stanley, 71 Hornsey Rise. No., the steel arms stamped with scales, two magnifiers and adjusters, triangular on shaped mahogany base with cover, 24½in. (62.2cm.) wide; and an Everard-pattern two-slider boxwood slide rule, 12in. (30.5cm.) long
See illustration (part lot) (2)