Wall, E. J. (Edward John), 1860-1928 · Boston, Mass., American Photographic Publishing Co. · leaf 210
ge back to blue. It is thus possible to slightly alter the colors of a heliochrome, either by warming or damp- ing, and as soon as the correct colors are seen it should be cemented up. The prism should be clipped on to the picture and then it should be placed in a warm place to dry. When dry, the… … easily be made as shown in Fig. 22. In this A BCD is the box, in one end of which is supported the heliochrome, while at the other end is a peep hole E through which the picture can be seen. M is a, small piece of mirror, adjustable on a hinge, which throws the light through the aperture KL cut in…
Color photography
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