Plane, circular, ground edges. Back silvered with protective coating
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Rectangular, all sides polished, made from slightly greenish glass free from bubbles Dimensions (a) 75 x 50 x 12 mm (b) 75 x 50 x 18 mm (c) 100 x 60 x 18 mm (d) 115 x 65 x 18 mm (e) 125 x 65 x 18 mm.
Having measuring range 0-32% sugar scale. Nicely packed in velvet box with zero adjusting screw driver.
To take lenses & mirrors of upto 75 mm diameter. Comprises a wooden upright 100 mm high, with a V shaped slot to hold convex or concave lenses or mirrors mounted on a rectangular wooden base.
Six lenses with ground & polished faces & ground edges. Comprises one each of: double convex, plano convex, converging concave-convex, diverging concave-convex, double concave, & plano concave. Supplied in a velvet lined box.
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