Roundel for use in optical experiments Size:XL: 80 x 80cm The Hippocanthus or Sea-Horse

The Hippocanthus or Sea-Horse

massed tents stretch along the French coast

Original is oil on panel 70x35

Bonaparte Crossing the Grand Saint-Bernard Pass

Roundel for use in optical experiments Size:XL: 80 x 80cm The Hippocanthus or Sea-HorsePlate 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