Semicircular mirror made of stainless steel.
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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 :
Optically worked, ground edges
Made from moulded glass, polished surfaces (a) 75 x 50 x 18 mm (b) 100 x 60 x 25 mm.
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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