With holder & choke 80W & 120W
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Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Comprising a metal holder with sides grooved to hold the lens or mirror. The holder is finished in matt black & is free standing for bench use, to hold lens 50 mm in diameter.
Photographic replica gratings mounted on a plate glass & suitable for visual. Grading size 25 x 25 mm, on glass plate 50 x 38 mm. The grating are of :
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.
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