500mm, diameter, steel, disc is faced with matt white. It
is marked every 5 , with extended lines every 10 and 30 ,
cross lines mark the centre. The disc is mounted on a 25 mm
diameter steel tube 390 mm long which fits into a stable base
with levelling feet. The disk rotates about it centre and
can be locked in any desired position. The lamphouse holds
a 12 V, 24 Watt axial filament lamp. This lamphouse is covered
by a rotatable outer shield that has various slots. By rotating
the shield light beams of varying width can be provided as
well as narrow single, double and triple beams. Attached to
the lamphouse is an adjustable lens carrier with lens to provide
diverging, parallel or converging light beams. The lamphouse
is mounted on a rotatable arm that can be locked in any position.
A sliding weight on the arm acts as a counterpoise.
All optical elements are supplied with magnets attached so
that they can be attached at any place on the disc. The disc
is supplied complete with the accessories listed below:
1 only Lamphouse with lamp, 2 only Plane Mirrors, 1 only Cylindrical
Mirror, 1 only Semicircular block, 1 only Bio-convex Lens,
1 only Bio-concave Lens, 1 only Trapezoidal block.