Decouverte

1843 · réf. 42662 — London Richard and John E. Taylor 1843. 4to. No wrappers as extracted from "Philosophical Transactions" 1843 - Part I. Pp. 1-6. First appearance of a pioneer-paper in the history of early photography as Herschel here for the first time describes his discovery of the iron printing process with ammonio-citrate of iron by both methods namely with blue lines on a white background and white lines on a blue ground. unknown