Similar to 3380-00 but with enhanced features for obtaining better
quantitative results. 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 a 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,
providing light for a brighter and sharper image. The 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 prism table 75mm diameter 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 upto 38mm
high.
Provided with a magnifying eye glass to read the vernier, tommy bar
for axis adjustment and flannel cloth. Supplied in a wooden box.
3381-00