objective lenses and control knob

Made:: circa 1920-1939 in London, York and England

maker:: Cooke, Troughton and Simms Limited

'Pathological set' of twelve objective lenses and brass control knob, each lens with a known defect, in fitted box, with separate telescope, all by Cooke, Troughton & Simms Ltd, for demonstrating the effects of imperfect lenses, probably c. 1920-1939. Also three home-made 'artificial stars' consisting of ball bearings mounted on rods on a wooden base. (One lens cracked.)

'Pathological set' of twelve objective lenses

circa 1920-1939

Brass control knob

circa 1920-1939

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Details

Category:: Optics

Object Number:: 2002-423

Materials:: glass, brass, mahogany, felt and metals

Measurements:: box: 40 x 287 x 190 mm
lenses (in mounts): 17 x 44 mm
telescope: 311 x 53 x 45 mm

type:: objective lens

credit:: J. A. Gould.

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