F. E. I.: The optics of trichromatic photography, Photographic Journal 40 (1900): 99-121 ; Brian Coe: Farbfotografie und ihre Verfahren (Munich 1979) ;
F. E. I. also developed (since 1890) and marketed his "Photochromoscope“-System of colorcamera & projector, inventor of the halftone screen in 1874.
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