Ives kromskop stereographic photochromoscope, c. 1895
Viewer for stereoscopic colour-separation transparencies. The separations are laid on the stepped part of the viewer over glass filters coloured red, blue and green. Strongly lit from above by the hinged mirror reflector at the rear, the three images are superimposed and redirected to the viewing lenses by internal reflectors. After manual adjustment to achieve correct register, the photograph can be viewed in true colours in three dimensions.