Wall, E. J. (Edward John), 1860-1928 · Boston, Mass., American Photographic Publishing Co. · leaf 138
126 COLOR PHOTOGRAPHY filters and transparencies. M and M' are two transparent mirrors at an angle of 45 degrees to the bottom of the box. is a mirror or white card or preferably a sheet of opal glass, which is hinged so as to allow of adjustment to obtain the best illumination of the aperture Z".… … sees through O the transparency placed at Z" through the mirrors M and M' . The picture at Z' is reflected by the mirror M' and passes through M to the eye. The picture at Z is reflected by the mirror M to the eye at O. The last two pictures are thus seen in an inverted and upright position at Z"…
Color photography
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