Wheel with fixed colour filters spread over several concentric circles allowing instant access to each colour. The number of colours available depends on the size of the wheel and each filter. One of the circles can be used to obtain a continuous “rainbow” effect with a choice of bright and saturated colours particularly suited to this purpose. A CMY subtractive colour change system can also be included as standard equipment. Using several colour wheels of this type together allows you to multiply the colour combinations.
(FR Patent No 1910122)