This is a robust instrument designed specifically for student use, which nevertheless is capable of very high performance.
The main structure is of a heavy cast metal, with bright plated fittings.
It comprises of :
SCALE: The scale in the form of a 150 mm diameter circle is fixed, while the table and telescope movements are completely independent of each other. Both movements can be read to 60 seconds 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 a fixed pillar and fitted with a 178 mm focus achromatic objective, and a 25 mm clear aperture. Also fitted is a unilaterally adjustable slit 7mm long.
TELESCOPE: Mounted on a moveable pillar and fitted with a 178 mm focus achromatic objective, and a 25 mm clear aperture. Also fitted is a 10X 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 in placing the prism with respect to the table levelling screws, and has interchangeable clamping units for the prism and a diffraction grating.
A variant model is also available: Spectrometer 150 mm circle, 30 seconds of an arc.
Thus, these spectrometers utilize the phenomenon of optical dispersion and the spectral analysis obtained with their help can reveal the composition of the object being analyzed, since each element leaves its spectral signature in the pattern of lines observed.