Paris: Gauthier-Villars, 1891. First edition. 12mo., xvi, 127 pp., frontispiece with tissue guard, illustrations in text, including one plate with a mounted color diagram of the visible color spectrum, and a folding diagram of Vogel's spectrographe with tissue guard. Half morocco and marbled boards, gilt-title within raised bands on spine, t.e.g. The binding shows slight wear with one tip scuffed. A very good copy. Item #26165
An early and important text that furthered the attainment of a true three color photography through spectrology and orthocromatics, the process by which photographs of colors are represented by their degree of intensity.
Roosens and Salu No. 7667.