Optical effects in crystalline materials under pressure Arnold wearing a dark coat and

wearing a dark coat and white cravat

with his dog sitting next to him

carrying a basket filled with the herb

The Elgin Room

Optical effects in crystalline materials under pressure Arnold wearing a dark coat andPlate 9 figures 1 14 from the paper 'On the communication of the structure of doubly refracting crystals to glass, muriate of soda, fluor spar and other substances, by mechanical compression and dilatation', by David Brewster, Philosophical Transactions of the Royal Society, vol. 106 (1816), pp. 136 178. The drawings are inscribed above with publication and plate details. Not signed. Royal Society stamp verso. Original: ink and watercolour on paper.