Vol. 1 #6 - Sept 1899. A reference magazine for the professional and amateur about the technical side of photography. Each issue focuses on one long, illustrated article. This issue features an in-depth look at orthochromatic photography (referring to a photographic emulsion that is sensitive to only blue and green light and can be processed with a red safelight) with many diagrams and illustrations. Also includes ads and small notes section. 4 3/4-in. x 7 3/4-in., 52 pages, B&W.
Cover price $0.25.