publication . Article . 2011

II. On the action of the rays of the solar spectrum on vegetable colours, and on some new photographic processes

John Frederick William Herschel;
Open Access
  • Published: 27 Sep 2011 Journal: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, volume 22, pages 5-21 (issn: 1941-5966, eissn: 1941-5974, Copyright policy)
  • Publisher: Informa UK Limited
149. In my paper on the "Chemical Action of the Solar Spectrum on preparations of Silver and other substances,” read to the Royal Society in February 1840, and of which the present communication is intended as a continuation or supplement, some experiments on the effect of the spectrum on the colouring matter of the Viola tricolor , and on the resin of guaiacum are described, which the extreme deficiency of sunshine during the summer and autumn of the year 1839 prevented me from prosecuting efficiently up to the date of that communication. The ensuing year 1840 was quite as remarkable for an excess of sunshine as its predecessor for the reverse. Unfortunately t...
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