539. F. E. IVES, USA LANTERN KROMSKOP

Projector for 3-color separation work, mahogany, plaque inscribed IVES LANTERN KROMSKOP US PAT. FOR COMPOSITE HELIOCHROMY, JULY 22 1890 No. 432530. One large and three small condensing lenses, internal beam splitting mirrors, three coloured filters, green, blue and red (not present), three Bausch & Lomb dividing lenses with rack & pinion focusing. Literature: Michel Auer (1990) The Guide to Antique Cameras, British Journal Almanac 1899. James Clerk Maxwell (1831-1879) was a Scottish physicist who first demonstrated a projected colour image by taking three black and white images separated through a set of primary coloured filters red, green and blue, then projected the three using the same correspondig filters so that the images were superimposed on a lantern slide as a colour image. Portable three-colour cameras were later produced, which could take three identical images which were exposed instantaneously using standard black and white film. The negatives which were printed using this process produced a color image

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