Hard crown glass, refractive index 1.519 to 1.523 25 x 25 mm 32 x 32 mm 38 x 38 mm
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Δ
Free from air bubbles, all sides polished
Glass, one each double convex, Plano – convex, concavo – convex, convexo – concave, Plano – concave and double concave lens, in box. Sizes in 38mm and 50mm. Lenses, Set of Six (50mm).
Optically worked, back silvered, with protective coating.
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
In metal frame and handle, chrome plated
90 mm diameter,16 mm thickness
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