Two identical units each with a Polaroid disc mounted in a rotatable mount with an aperture of 25 mm. Both mounts have a pointer moving over a 75 mm diameter scale divided 0-90°-0-90°-0 x 1° .
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Rectangular, glass, back silvered, with protective coating
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
Sizes :
75 mm long, 115 mm radii, 25 mm thickness
Brass dial head 40 mm diameter, divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on tripod stand, distance between legs 40 mm.
Sizrs are mentioned below:- Screw pitch 1 mm Screw pitch 0.5 mm
Optically worked, back silvered, with protective coating.
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