Colours in layers of mica and glass mb-height 5524 Onlookers watch from boats on

Onlookers watch from boats on the Thames

'Edinburgh Street'

Old Bailey

'Caution to Young Ladies who ride in Crinoline on Donkeys'

Colours in layers of mica and glass mb-height 5524 Onlookers watch from boats onColours observed within layers of mica (figures a f) with concentric circles of sixteen colours based upon Isaac Newton's observation of colours produced at the contact of two telescope object glasses (figure g). Plate 1 from the monograph A new elucidation of colours, original prismatic, and material; showing their coincidence in three primitives, yellow, red and blue, by James Sowerby (London, Richard Taylor and Co., 1809). Inscribed 'Tab. 1' top