MS-292 PVG ROTATABLE OPTICAL DISC

Consist of a steel disc diameter 500 mm. in matt white color,
o o o marked at every 5 with bigger lines at 10 and 30 and with cross
o
cutting lines at 90 for taking centre. Disc mounted on a steel tube
diameter 25 mm. length 400 mm. on a heavy stable cast tripod
base. Disc freely rotatable at centre can be stopped at any position
by friction disc. Lamp house in two parts, the outer rotatable and
slotted gives light beams of varying width, narrow single, double
and triple beams. Inner having the lamp holder and a 12 V 24 W
s.b.c. axial filament lamp. Attached to the lamp house is adjustable
lens carrier with lens to give diverging, parallel or converging light
beams, lamp house mounted on a rotatable arm can be stopped at
any position by friction disc.
Accessories :-
I. For Reflection: (a) A plane glass mirror size 50 x 25 mm.,
mounted in a wooden holder and with a magnet for
attachment to the disc.
(b) A polished plated metal cylindrical mirror of radius 75 mm.
with two magnets.
II. For Refraction: (a) A semicircular perspex block radius 50
mm., thickness 20 mm. with two magnets.
(b) Lens biconvex, perspex, radius of curvature 180 mm. with
two magnets.
© Lens biconcave, perspex, radius of curvature 180 mm.
with two magnets.
o (d) Right angled 45 perspex prism.