objective lenses and control knob

Made:
c. 1920-1939 in 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.)

Details

Category:
Optics
Object Number:
2002-423
Materials:
brass, felt, glass, mahogany 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.