Equilateral, 60° x 60° x 60°, 57 mm side
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Δ
90 mm diameter,16 mm thickness
Free from air bubbles, all sides polished
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.
All plastic frames
Wooden, with V shaped slot to take spherical lens or mirror up to 75 mm diameter, with index mark. Lense holder, Wooden, 'V' Shaped.
75 mm long, 115 mm radii, 25 mm thickness
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