A most popularmoving effects
projector is an adaptation of a rudimentary theatrical luminaire, the
PC spot
to which a more sophisticated optical
lens
system has been added, as well as a heat shield, a condenser lens, and an objective lens. A rotating drum containing a transparent painted disc is placed at the front of the unit.
The disc is painted with the desired moving effect. Common effects are storm clouds, rain, water, fire and snow .
The motor which rotates the disc can be remotely controlled, and a gear system allows assigning various speeds. Sometimes a magazine with an endless
loop
of film is used instead of a disc.
As
moving effects
projectors typically use a 1000-2500W tungsten-halogen lamp, they can be controlled by common
stage
dimmers and control boards. Simplicity, low cost, and visual effectiveness, have made the moving effect
projector
standard equipment which is readily available in most theatres.
