1&1/2 meter long consists of two rods
on heavy cast iron feets with leveling screws with four
heavy riders two sliders have liter motion with lens
holder &two needless.
(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.