Scale: 150 mm diameter circle is fixed, the table and telescope movements are completely independent of each other. Both movements can be read to 30 sec. of arc by means of double ended
verniers. Both rotations have fine adjustment screws, and release of a clamping screw enables coarse adjustment to be made by hand.
Collimator: mounted on fixed and pillar and fitted with 178 mm focus achromatic objective, 28 mm clear aperture. Also fitted is a unilaterally adjustable slit 7mm long.
Telescope: mounted on moveable pillar and fitted with 178 mm focus achromatic objective, 28 mm clear aperture. Also fitted is an x 10 Ramsden eyepiece and glass cross line graticule. Both the telescope and the collimator have rack and pinion focusing.
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.
Standard accessories supplied:
• 1 x prism clamp
• 1 x diffraction grating holder
• 1 x Hand magnifier
• 1 x tommy bar for adjusting optical axes
• 1 x plywood case
Comprehensive setting up instructions also provided. Supplied WITHOUT prism.