Three-color projector for additive color mixing with arc lamp.

Three-color projector for additive color mixing with arc lamp. The Three Color Projection Unit consists of red, green and blue glass filters. Three lenses are used to control where the colored spots hit the screen and overlap. The unit mounts on an optical bench, and the light source is an intense white carbon arc. The brightness of each spot can be varied by controlling the aperture for each filter. (Setup Note: remove both masks behind the condensor lens to spread out the beam. The 7" condensor works best.)