The history of three-color photography (1925)

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Stereoscopic Pictures with Autochromes 569 n Fig 153 (Page 570). Fig. 152. f. S2 82 \ Fig. 154. from the other by the fact that in it the two points are almost exactly perpendicularly one above the other. Assuming now that the two points are to be obtained on an Autochrome print. In Fig. 151, in place of our eyes, we imagine two lenses Ox and Or at suitable distances ; behind is the plate, glass side to the lenses. If, after exposure, development and so on, the finished plate is placed in the same position as that which it occupied at exposure, the two pictures are seen, of course, upside down, but the right-hand one is behind the right-hand lens, and the left behind the left-hand lens, as shown in Fig. 152. If we turn the plate on its long axis, so that the glass is towards us, the pictures are upright and in the right position to correspond to the