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THE OPTICAL LANTERN AND CINEMATOGRAPH JOURNAL.
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Stereoscopic Camera for Three = Colour Work.
Mr. W. N. L. Davidson, of 20, Middle Street, Brighton, has patented an apparatus comprising a stereoscopic camera, which can be used for threecolour photographic work ; and a special double dark slide. The red sensitive plate /, Fig. 1, is exposed through an orange
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filter g on one lens c. In the other half of the plate carrier e, the two plates, //, »", are placed face to face, with a suitable filter j between them, at the back being yellow or green sensitive plate /;, and in the front an ordinary or blue sensitive plate V. The lens b is stopped down to a much smaller aperture to balance the exposures. To get a complete set of pictures required for a stereoscopic photograph, the above arrangement of plates is exposed in a reversed position, and for this purpose the double dark slide, Fig. 2, is provided. The rabbets in each leaf, k, m, are deep enough to take two plates, and the red filter /, n, are placed in the relatively opposite halves of the two leaves. The camera has a sliding baseboard, so that,
when stereoscopic photos are required, the axis of each lens can be brought successively in the same position relatively to the object photographed. The inventor claims that the double dark slide above described may be used in combination with Theodore Brown's Stereoscopic Transmitter, in which only one lens is required for obtaining the dissimilar pair of images at one exposure.
Stereoscopic Picture Envelopes.
The accompanying cut shows a device invented by Mr. L. Walfram, of Austria. In his complete specification he thus describes it. Picture post cards are provided with stereoscopic photographs, and are transmitted in cardboard or like envelopes or casings convertible into
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stereoscopes. The envelope, shown unfolded into stereoscope form, consists of rectangular parts 1, 2, 3, 4, and a triangular part closing into a slot 8 in the part 2. The part 4 folds along intermediate lines 9, io, to form ends 12, n. The parts 1, 3 form, in one case, pockets for the post cards, and in the other case walls of the stereoscope. The part 2 is fitted with lenses 6, and an intermediate