6F10.10 • Synthesis of Color: Projecting Colored Filters

Location: Cabinet 4

Photo of the Demonstration at the University of Texas at Austin.

Instructions / Notes:

• A projector lamp projects a red, green and a blue beam onto a wall.
• The device in front of the projector lamp is a Von Nardroff color mixer, circa 1960.
• The position of the 3 beams are adjustable by moving the lenses. Each circle should overlap by approximately 1/3rd in the center .
• The intensity of each beam is also adjustable by varying an aperature for each color.
• Ideally - Wratten filters #19,47, and 61 are used.
• Image below appoximates what students will see in class.

Last updated on June 8, 2026