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° .
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.
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