Description
He was killed in 1938 when
'Cardwell's Collapse'
View of the Royal Exchange fire
and the shell icon of a previous pilgrimage is in his hat
Roundel for use in optical experiments Finish:Pack of 20 He was killed in 1938Plate 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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