The Kromoscop is a three-color projector invented by Frederic E. Ives (1856-1937), the American inventor who is best known for the half-tone process used to reproduce black and white photographs. Ives was forty years old when the picture at the right was made    The device was developed in the last years of the 19th century, and uses three black and white color slides taken using color filters. The same filters are used to project the slides onto a screen, with the images converging. Here, part of the top lid has been opened up, showing the filters. The version here, called the "Science Lantern", including six sets of transparencies, was $80 about 1900.    The projector is in the Jack Judson Collection at the Magic Lantern Museum in San Antonio, Texas.

   There is also a three-dimensional version of the Kromoscop. Here, six positive transparencies ("Kromograms") are needed: red, blue and green for the right eye, and the same trio for the left eye. The left-hand picture shows one of the transparencies placed on the Kromoscop. In front of each stereoscopic pair is the proper color filter, and inside the box are colored plates of glass set on forty-five degree angles for transmitting the image to the viewing lenses. With eight Kromograms the viewer cost $50 about 1900. This device is in the Greenslade Collection.