'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.)
- Object Number:
box: 40 x 287 x 190 mm
lenses (in mounts): 17 x 44 mm
telescope: 311 x 53 x 45 mm
- objective lens
- J. A. Gould.
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