To measure the wavelength of the light by the reflected system, frame 60 x 58 x 50 mm high with a glass plate mounted at an angle of 45° to reflect light downwards on a plano-convex lens of one metre focal length, resting on a glass plate 38 x 38 x 3 mm. Complete with lens.

600 lines per mm, transmission type, 30 x 25 mm, with protective glass cover.

Spectrometer with dia 170 mm, metallic scale graduated 360° x 1° independently rotatable, with locking screw, vernier attached to the telescope reads to 0 to 1° (6 minutes of arc).Collimator is mounted on a fixed pillar, with an achromatic objective of 150 mm focal length and 21 mm aperture, and has an adjustable slit 6 mm long. The telescope is on a movable pillar, with a fine adjustment screw, an achromatic object of 170 mm focal length, 21 mm aperture. Ramsden eye-piece and glass crosswire graticule. Both collimator and telescope have spiral focussing system and have axis adjusting arrangement. The table has three levelling screws, with lines marked to assist prism placement. With prism holder and grating holder, one small screw driver and one tommy bar for axis adjustment. Without prism.

A model for student use, with an optical system equivalent to that on more advanced models, thus permitting many quantitive experiments. Graduated disc 150 mm dia fixed to table, double ended vernier, to read to 1 minute of arc, attached to telescope. Both telescope and table have fine adjustment screws and release of clamping screw enables coarse adjustments to be made by hand, telescope and collimator are fitted with 175 mm focal length, 32 mm clear aperture achromatic objectives and have rack and pinion focussing telescope fitted with x 15 Ramsden eye piece and crossline graticule, Both telescope and collimator have rack and pinion focussing and their optical axes can also be adjusted. Prism table has lines to assist prism placement and has three levelling screws. Complete in hard wood case with the following accessories: One prism clamp, one diffraction grating holder, one tommy bar for adjusting optical axis. supported by four legs having levelling screws. Size of the tank is 580 x 500 x 70 mm supplied complete with rippler assembly, two straight obstacles 130 mm long, one straight obstacle 40 mm long, curved reflector 200 mm radius, transparent refraction plate, wooden wave roller, one pack of rubber bands, water dropper, sponge, illuminator and power supply.

With holder and choke 80 W and 125 W

The circular head is attached near the analyser and vernier movement on the scale enables the reading of optical rotation accurate upto the accuracy of 0.10. Soleil’s Bi-Quartz or Laurent’s half shade device which makes the instrument accurate and simple and simple for use with white light (day light) or sodium light. The polarimeter tubes made form Borosilicate glass with metal fittings at both ends. The tube end covers with glass round disc, optically true with rubber washers to make it leak proof. Complete with a set of two polarimeter tubes (100 mm and 200 mm), to measure the angle of rotation of optically active substance in solution. Packed in a case.