A 75 mm metal screen with 10 mm central aperture covered with wire gauze.
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Optically worked, back silvered, with protective coating.
Sizes :
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
90 mm diameter,16 mm thickness
75 mm long, 115 mm radii, 25 mm thickness
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