A fine Ross-Zentmayer binocular microscope signed on the foot ROSS LONDON 5175 with Wenham binocular body tube and prism, rack and pinion focusing, square rackwork to rectangular housing, main limb with micrometer fine focusing, central axis, with circular mechanical stage with silvered scale, swing arm substage condenser, with rack and pinion vertical and horizontal motion, plano-concave mirror on swing arm with sliding collar on two tapered trunnion supports on V shaped foot -19¼in.high with accessories in fitted case including a binocular prism in brass case, three cased Carl Zeiss objectives, a paraboloid illuminator, stage reflector and stage forceps, in fitted mahogany case with brass carrying handles c.1885 - 20½in(52cm)high (2)

Details

A fine Ross-Zentmayer binocular microscope signed on the foot ROSS LONDON 5175 with Wenham binocular body tube and prism, rack and pinion focusing, square rackwork to rectangular housing, main limb with micrometer fine focusing, central axis, with circular mechanical stage with silvered scale, swing arm substage condenser, with rack and pinion vertical and horizontal motion, plano-concave mirror on swing arm with sliding collar on two tapered trunnion supports on V shaped foot -19¼in.high with accessories in fitted case including a binocular prism in brass case, three cased Carl Zeiss objectives, a paraboloid illuminator, stage reflector and stage forceps, in fitted mahogany case with brass carrying handles c.1885 - 20½in(52cm)high (2)

Literature

Cf. Gerald L'E Turner The great age of the Microscope pp.161-163

Lot Essay

The Ross-Zentmayer No.1 was based on the swinging substage assembly invented by Joseph Zentmayer 1826-88. Ross tooh out a patent in the name John Stuart of No.7 Wigmore Street for 'improvements in microscopes. A communication from abroad by Joseph Zentmayer of Philadelphia'. The patent No.3078 was granted on 1 August 1876

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