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.
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