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Commercial Road
30th March 1966
Priory of Holy Trinity or Christchurch
towards two young ladies
as an English rarity
Roundel for use in optical experiments Product:Postcard Commercial RoadPlate 9 figure 2 from the paper "New experiments on the ocular spectra of light and colours", by Robert Waring Darwin, Philosophical Transactions of the Royal Society, vol. 76 (1786), pp. 313 348. Roundel intended for use in exploring colour perception. In the written experiment circular pieces of silk are overlaid in the sequence blue (outer), yellow, pink, green and indigo (inner) with a central spot. "look steadily for a minute on this central
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