Roundel for use in optical experiments Finish:Pack of 20 Below her are the other

Below her are the other guests

The king is seated on a throne with the archbishops and bishops doing homage and figures looking on from the sides

Early versions had a tendency to 'lift' at the front when approaching the top speed of almost 160 mph

View of the Royal Exchange fire

'Cardwell's Collapse'

Roundel for use in optical experiments Finish:Pack of 20 Below her are the otherPlate 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