Lyon: Société Anonyme des Plaques et Papiers Photographiques A. Lumière & Ses Fils, 1910. 8vo., 36 pp., illustrated by tables and a diagram. Printed paper wrappers. Very good. Item #29027
The latest investigations from the laboratory of the Lumière brothers; it includes the effect of artificial light on autochromes plates, and research into photographic papers, including polychrome. Text in French.