Starlac Industries

Mahesh Nagar, Ambala, Haryana

Its optical system and features are equivalent to those of advanced model making it still able for senior students to do many quantitative experiments. Substantial iron casted base with leveling screws, protected graduated disc 150 mm diameter, fixed to table, double ended single vernier reading to 1 minute of arc attached to telescope. OpticsTelescope : 178 mm focus achromatic objective, 25 mm clear aperture, 8 X Ramsden eye-piece with cross line graticule, rack and pinion focusing. CollimatorMounted on fixed pillar and fitted with achromatic object glass 178 mm focus, 25 mm clear aperture, adjustable precision slit, rack and pinion focusing. Prism table with leveling screw and its height is adjustable, surface marked with parallel lines to facilitate leveling of prism. Supplied complete with prism clamp and grating holder, watch makers eye lens to read vernier and tommy bar without prism and gratings. Supplied in beautifully polished wooden case with lock and key.

Accessories

a) Crown glass prism : Equilateral 38 x 38 x 38 mm or 25 x 25 x25 mm as per requirement; Refractive index 1.52, optically worked.b) Dense flint glass prism : 32 x 32 x 32 mm refractive index 1.62; optically worked.c) Extra Dense flint glass prisms : 32 x 32 x 32 mm; refractive index 1.65; optically worked.d) Polariser & Analyser : Polariser and analyser each of 25 mm aperture mounted to fit on to telescope and collimator.e) Quarter Wave Plate: For sodium light, 20 mm clear aperture, in graduated rotary mount reading to 5 , on a metal stage for use in diffraction grating holder ofspectrometers.f) Plane Mirror : Silvered both sides, to provide a reflecting surface at the prism table, in metal mount to fit diffraction grating holder.g) Gauss Eye Pieceh) Diffraction Grating Replica : 13000 tines persq. inch or 6000 lines per sq. inch or as required.

Good for many quantitative light experiments by students at Junior level, reading to 0.10 (6 minutes of arc) The base combined with the collimator tube support, carries arc rotating telescope arm. The collimator and telescope tubes are one piece casting of light alloy, focusing by friction drive rack and pinion, 170 mm dia circular scale reading 0.10 but 0.050 can be estimated due to larger width of scale, Optics: Telescope : With achromatic object glass of 170 mm, focus, 21 mm clear aperture, 8 X Ramsden eye piece with hair line graticule, helical focusing, fine motion, tangent screw for finer adjustment. Collimator: Mounted on fixed pillar with axial adjustment. Objective 150mm F.L. and 21mm aperture, helical focusing, unilateral adjustable slit 6mm long. Prism Table: fitted with three spring loaded leveling screws and marked lines. Supplied complete with tommy bar, screw driver and grating holder but without prism and gratings. This Spectrometer is normally supplied in strong cardboard box but it can be supplied in wooden box with lock & key on demand.

For the rapid examination of spectral composition of light. Metal tube with draw out focusing and an adjustable slit. The eyepiece is mounted at the end of the draw tube and is adjustable in relation to the slit, so that sharp, spectrum can be obtained. Supplied complete in wooden or velvet lined case.