For introducing students to principal type of spectra, determination of wavelength, frequency of emitted light and for quantitative spectrometric measurement of angle of prism, refractive index of the prism material etc. Comprised of a cast base with an integral fixed pillar for the collimator support and a swinging telescopic arm.

Both the collimator and the telescope are fitted with an axis adjustment system. The moving telescope arm with a spring loaded vernier moves smoothly over a machine engraved degree plate of diameter 180mm and is graduated 0-360 degress x 1. The vernier reads to 0.1 degress or 6 seconds and allows students to estimate angular positions to 0.05 degrees. Fine adjustment is provided. The collimator and the telescope tubes are fitted with optically coated achromatic objectives of diameter 25mm and have a concealed helical action focusing device.

The 10X Ramsden eyepiece has a cross hair reticle. The prism table, diameter 75mm is levelled by three knurled knobs. It is fitted with a diffraction grating holder of aperture 25 x 25mm and a clamp for holding a prism up to 38mm high.

Provided with a magnifying eye glass and a tommy bar for axis adjustment but without prism or diffraction grating. Supplied with instructions.