Belt Spin Model (P582F)
Well finished product used for demonstrating that white light may be composed from all the spectral colours by rotation of the multi coloured disk. Mounted on a metal stand the 180mm diameter disk is driven by a belt with the help of the hand driven wheel.
Hand Spin Model (241-001)
Approx 200mm dia. Used to demonstrate how white light can be composed from a mix of primary colours.
This product has met the following criteria: