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.
