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This apparatus was inspired by the work of Sir Isaac Newton (1642-1727) in showing that white light is made from a range of colours called the spectrum. It consists of a circular disc of plastic with narrow wedges of colours in the hues of the rainbow, plus white. The sequence of colours is repeated twice around the disc. If spun at high speed, the colours on the disc will appear to merge into a off-white tinge due to the persistence of human vision.
Mounted on a metal stand the 180 mm diameter disc is driven by a rubber belt with the help of a hand-driven wheel.
Please note that the actual colours vary from the picture (e.g. white is missing; the colours are a little lighter). We will replace the photo with a better one asap...
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