INVENTIONS, DISCOVERIES, PUBLICATIONS, AND APPLIANCES, FORMING FACTORS IN THE INCEPTION, DISCOVERY, AND DEVELOPMENT OF PHOTOGRAPHY.
1432 B.C. Iron said to have been first discovered.
424 B.C. Lenses made and used by the Greeks. And a lens has been found in the ruins of Nineveh.
79 A.D. Glass known and used by the Romans.
697. Glass brought to England.
1100. Alcohol first obtained by the alchemist, Abucasis.
1287. Nitric acid first obtained by Raymond Lully. Present properties made known by Dr. Priestley, 1785.
1297. Camera-obscura constructed by Roger Bacon.
1400. Chloride of gold solution known to Basil Valentine.