细节
A lacquered-brass compound monocular microscope,
by R & J Beck LTD London & Philadelphia No. 8670, the folding stand with circuit stage, rack and pinion coarse and micrometer fine focusing, with accessories, in mahogany case 15 7/8in. (40.3cm.) wide
See Illustration
by R & J Beck LTD London & Philadelphia No. 8670, the folding stand with circuit stage, rack and pinion coarse and micrometer fine focusing, with accessories, in mahogany case 15 7/8in. (40.3cm.) wide
See Illustration