Plane, circular, ground edges. Back silvered with protective coating
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Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
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.
Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
Optically worked, in velvet lined case
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