Description

This instrument is specifically designed for
advanced work but is sufficiently robust for
individual student use. It is capable of high
performance. The main structure is of heavy cast
metal with bright plated fittings. The instrument is
mounted on a baseboard which fits into a polished
hardwood case. SCALE: 177mm diameter circle
is fixed. The table and telescopic movements
are completely independent of each other. Both
movements can be read to 30sec. of arc by means
of double ended verniers. Both rotations have fine
adjustment screws. Release of a clamping screw
enables coarse adjustment to be made manually.
COLLIMATOR: Mounted on a fixed pillar and fitted
with 178mm focus achromatic objective with
32mm clear aperture. TELESCOPE: Mounted on
a movable pillar and fitted with 178mm focus
achromatic objective with a 32mm clear aperture.
Also fitted is x15 Ramsden eyepiece and a glass
cross line graticule. PRISM TABLE: The table is
marked with lines to assist placing the prism
with respect to the table levelling screws and has
interchangeable clamping units for the prism and
a diffraction grating.