Plane, circular, ground edges. Back silvered with protective coating
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Optically worked, back silvered, with protective coating.
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.
Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
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 :
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