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Stainless steel, semicircular.
Size diameter x height mm .................. 150 x 75
(A) From Indian glass, size mm...... 100x60x18, 100x60x25 & 75x50x18.
Non optically worked, either in normal Indian glass or
superior extra white glass, polished faces and slightly
bevelled edges.
(a) EQUILATERAL PRISMS 60 angles, available in 25, 32, 38
and 50 mm.
(b) RIGHT ANGLED PRISM Angle 90 and other 45 each.
length x height mm......25 x 25, 32 x 32 and 38 x
38. |
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