Période

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A scheme for an artificial rainbow with the primitive colours only, A new practical treatise on the three primitive colours
LZT19B31_454

A scheme for an artificial rainbow with the primit...

Subject 1, shows three degrees of each of the nine colours of the system as affected by various dgrees of shade, A new practical
LZT19B31_455

Subject 1, shows three degrees of each of the nine...