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.
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.
Optics
Telescope : 178 mm focus achromatic objective, 25 mm clear aperture, 8 X Ramsden eye-piece with cross line graticule, rack and pinion focusing.
Collimator Mounted 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.
It is meant for group of students to perform experiments on simple optics, to demonstrate the principles of images formation using simple pinhole camera and then proceeding towards the use of a single lens to obtain images of greater brilliance with clarity. The effect of aperture variation on the depth of the field may also be shown.
This kit comprises of the following:
8 cardboard boxes 150 x 100 x 100 mm with hole, screen and lid. 50 Nos sheets of black paper, 200 x 250 mm 1 No. 200 Watt filament lamp 1 No. Mounted lamp holder with flex. 1 Packet of Pins
