Collimating Tube :( Material: Brass Pipe) O.D.: 50 mm I.D.: 44 mm for fitting collectivization it is provided with rack & pinion arrangement and slit. Slit is of circular type. The jaws of the slit are optically ground. It is provided with Hoffman's Diaphragm.(b) Telescope Tube : (Material : Brass Pipe)O.D. : 50 mm, I.D. : 44 mm for fitting telescope is provided with rack & pinion arrangement for proper focusing of spectral lines. Eyepiece ; (Ramsden Type) : magnification :10 x In eyepiece holder a conical pointer is fitted in the focal plane of eyepiece(c) Corrected achromatic doublet are fitted in the lens holders of collimator and telescope tube.(d) Suitable gap is provided between collimating lens and prism table to accommodate high resolving instrument like Fabry-Perot E talon.(e) Prism Table is fitted on the machined cast iron plate and actuated by tangent screw to provide smooth rotation of the C.D.S. prism placed on it.(f) Prism table is covered with a box of a aluminum casting having two gates. One gate allows light coming from collimator to enter into C.D.S. Prism Another gate allows light to be collected by telescopic objective after light being dispersed from C.D.S. prism.(g) A calibrated drum (Calibration for visible region i.e. from 4000 A°- 7000 A°) is attached with the prism table assembly. Accuracy of calibration + 5 A°
(h) Machined cast iron plate with drum assembly is fitted over the head of a heavy cast iron base 
The base and machined cast iron plate are painted in a staple Grey color
Collimator Telescope Prism table drum assembly are painted black Total Weight 20 kg.