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To demonstrate that white light is composed by all seven spectral colours. It comprises a multicoloured card or tin sheet mounted on a stand, driven by a hand wheel. When the disc is rotated rapidly it gives impression of white, thus demonstrating that white light is composed of all spectral colours.
| Cat. No. |
Description |
| A |
With coloured disc. 150mm dia, & mounted on Laminated wooden base. |
| B |
With coloured disc. 200mm dia, & mounted on Laminated wooden base. |
| C |
With coloured disc. 150mm dia, & mounted on light metal base. |
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