1840. “On the Art of Photogenic Drawing,” by Alfred S. Taylor, lecturer on chemistry, &c., at Guy’s Hospital. Published by Jeffrey, George Yard, Lombard Street, London.
— “The Handbook of Heliography, or the Art of Writing or Drawing by the Effect of Sunlight, with the Art of Dioramic Painting, as practised by M. Daguerre.” Anon.
— Wolcott’s reflecting camera brought from America to England and secured by Mr. Beard, patentee of the Daguerreotype process.
— The moon photographed for the first time by Dr. J. W. Draper, of New York, on a Daguerreotype plate.
— John Frederick Goddard, of London, inventor of the polariscope and lecturer on chemistry, employed chlorine added to iodine, and afterwards bromine, as accelerators in the Daguerreotype process.
1840. Antoine F. J. Claudet, F.R.S., of London, employed chlorine for the same purpose.
— M. Fizeau, of Paris, deposited a film of gold over the Daguerreotype picture after the removal of the iodine, which imparted increased brilliancy and permanency.
— Chloride of platinum employed by Herschel.
— Fox Talbot’s developer published September 20th.
1841. Calotype process patented by Fox Talbot, September 20th.