Low cost model with features comparable to standard spectrometer, and main structural parts of heavy casting, ensuring ruggedness.
Base. Heavy, cast iron base, oven baked paint. Base and collimator tube pillars are cast into one unit. Heaviness of base ensures stability.
Scale. Main scale, diameter 17.5cm, divided 0-360 X 1°, mounted on the same central shaft as that of telescope, with locking screw, and independently rotatable. Spring-loaded vernier scale with LC 1/10° (6 minutes) mounted on telescope pillar moves in groove along rim of main scale.
Telescope. Mounted on a moveable pillar, with fine adjustment screw, locking screw and axis adjustment. Achromatic objective of diameter 25mm and focal length 17.8cm. Ramsden eyepiece with crossline graticule. Helical sliding focusing arrangement of objective.
Collimator. Achromatic objective of diameter 25mm and focal length 17.8cm. Mounted on a fixed pillar with axis adjustment and vertical slit. Slit has one spring loaded, 6mm jaw adjustable by a screw. With helical sliding focusing arrangement of objective.
Prism table: Diameter 8cm, mounted on the main scale table with three spring-loaded, leveling screws. Marked with grooved lines to assist positioning of prism. Has clamping units for mounting prism and diffraction grating.
Standard accessories include prism clamp, grating holder, tommy bar to adjust axis of teleascope and collimator tube, and magnifier lens to read vernier.