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Optical Bench Double Rod
One meter long consists of two rods on heavy sliders; two sliders have liter motion with two lens holder & two needles.
(a) OPTICAL BENCH: Same as above but both rods of steel C.P.
(b) OPTICAL BENCH: Same as above but both brass-covered pipe inside steel rods.
(c) OPTICAL BENCH: Same as above but both stainless steel rods.