ROTATING DISC OF SIR ISAAC NEWTON FOR MIXING COLOURS 



The Spectroscope sorts out the above seven colours from sunlight (which is compounded of these seven colours). If painted in 

 proper proportions on a wheel, as shown in the coloured illustration, and the wheel be turned rapidly on a pivot through its centre, only 

 a dull white will be perceived. If one colour be omitted, the result will be one colour the result of the union of the remaining six. 



