SIR JOHN F.W. HERSCHEL - On the Chemical Action of the Rays of the Solar Spectrum on Preparations of Silver and Other Substances, both Metallic and Non-metallic, and on some Photographic Processes. [with] On the Action of the Rays of the Solar Spectrum on Vegetable Colours, and on some New Photographic Processes.

Philosophical Transactions, 1840 and 1842. 2 items. 4to. pp. 59> 2 plates: 181-214> folding plate. Disbound but joined together. Extracted from Philosophical Transactions 1840 and 1842. These two papers are early and pioneering work on the development of photographic processes in relation to photochemistry> the second paper is the first description of 'photocopying' later used in the production of cyanotypes.

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