Spectrometer advanced (Each)

Consists of a heavy cast base and a pillar for collimator support. The
telescope arm moves along a fixed circular plate 150mm diameter graduated in
degrees. This plate has a double ended vernier for better and accurate
measurements, with at least count of 30. Fine adjustment is accomplished by
using a knob while the coarse adjustment can be done by hand. Both the
collimator and the telescope are mounted with an axis adjustment system. The
telescope has a 10x Ramsden eyepiece and is fitted with a cross hair reticle.
Both the telescope and the collimator are fitted with coated achromatic
objectives of 178mm focal length and 32mm diameter. Focussing is done by a
concealed rack and pinion. The collimator slit 6mm long, is specially designed
for retention of initial accuracy during the life of the instrument. The 75mm
diameter prism table is held with the help of a clamping screw enabling the
table to be rotated in any direction. It has lines and concentric rings marked
to assist positioning of prism in relation to levelling screws. It is fitted
with a diffraction grating holder of aperture 25mm x 25mm and a clamp for
holding prisms up to 38mm high.