This instrument is specifically designed for higher level 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.
This product has met the following criteria: