Paris, France, 1890s–1930 (Publisher, Printer, Photographer)
The Parisian printing firm of E. Le Deley (E. L. D.), located at 73, rue Claude Bernard, was founded by the photographer Ernest Louis Désiré le Deley (1859–1917). The company was a major publisher of heliotype, black-and-white postcards. After Le Deley’s death, the firm was run by his sons, but went bankrupt in 1930. Heliotype printing involved exposing a gelatin film under a negative, hardening it with chrome alum, and printing directly from it.
References:
E. Le Deley [firm], Musée du Louvre: Héliotypies de E. de Delay (Paris: [sp], 1908).