Smith's Marine Safe Distance Finder
nautical calculator in slide rule form, ebony with celluloid scales, stamped 'Patent No. 12101 applied for, Sole agents Lilley & Son, 10 London St, London E.C.', instructions (with losses) pasted to base 'to make calculations without having to rule bearings on the chart or leave the bridge', in mahogany case, rule 25.6cm
Sold for £72
Result plus buyers premium
nautical calculator in slide rule form, ebony with celluloid scales, stamped 'Patent No. 12101 applied for, Sole agents Lilley & Son, 10 London St, London E.C.', instructions (with losses) pasted to base 'to make calculations without having to rule bearings on the chart or leave the bridge', in mahogany case, rule 25.6cm