Plate, polarised light rings and tints of crystals by [John Frederick William Herschel] Plate V containing figures 1-5 which show diagrams of polarised light rings and tints of crystals. Likely drawn by Herschel. Subject: Physics Published in Philosophical Transactions as 'On the action of crystallized bodies on homogeneous light, and on the causes of the deviation from Newton's scale in the tints which many of them develope on exposure to a polarised ray'. Read 23 December 1819. [1819]