Board with scale for machine for finding the roots of cubic equations both real and impossible Board with scale for machine for finding the roots of cubic equations Mathematics

Japanese abacus supplied by the Japanese Chamber of Commerce & Industry, 1996. Japanese abacus Mathematics

Sliding calculator, plastic, issued by Ciba laboratories Ltd., Horsham, Sussex, 1950-1979 Sliding calculator Materia Medica & Pharmacology

Japanese abacus, 21 columns each with 5 plus 1 beads, (piece of wood at back of frame missing) Japanese abacus, 21 columns each with 5 plus 1 bea Mathematics

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Roegiers's nomogram and ruler for finding the viscosity of oil mixtures, printed on thin metal sheet Roegiers's nomogram and ruler for finding the visc Mathematics

"Napier's Rods" in case with descriptive leaflet, arranged by J. Blater; published by Trubner & Co. 1888 "Napier's Rods" in case with descriptive leaflet, Mathematics 1888