Ambala, Haryana, India
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This is a robust instrument designed specifically for student use which is capable of very high performance. The main structure is of heavy cast metal, with bright plated fittings.Scale : The 150 mm. diameter circle with protective shield is fixed to the telescope movement and the table is attached to the double ended vernier which reads to 1 minute of arc. Both telescope and table rotation fine adjustment screws, and release of a clamping screws enables adjustment of both movements to be made by hand.
Collimator : Mounted on fixed and fitted with 178 mm. focus achromatic objectives, 25 mm. clear aperture. Also fitted is a unilaterally adjustable slit, 7 mm. long.Telescope : Mounted on moveable pillar and fitted with 178 mm. Focus achromatic objective, 25 mm. clear aperture. Also fitted is a 8x Ramsden eyepiece and a glass crossline graticule. Both the telescope and collimator have rack and pinion focussing. Means are provided for levelling the axis of both optical units and for squaring them to axis of rotation.
RDV-1 A complete and light weight direct vision spectroscope without wavelength scale, for observing visible radiations from 400 to 750 mm.
RDV-2 A compact visible spectroscope with wavelength scale which allows the direct reading of spectral length and employs a prism for dispersion. It is also useful for flame test of basic radicals (sodium, strontium, potassium, copper etc.) There is a single eyepiece and independent focussing tube for the graticule, which carries an index at 590mm. with "D", marked right below the scale, (corresponding to the wave length of sodium light) can be calibrated to a known light source by adjustment of knurled screw. The amount of light admitted to the spectroscope can be regulated by a variable slit, adjusted by a knurled ring round the rating tube.
