. The book of photography; practical, theoretical and applied. uplicon (see Figs. 827 and 829) an ordinary half-plate printing frame is all that is needed,since no transposition is reciuired. Transparencies in the Camera. The second method of making stereo-scopic transparencies is by copying the C2G THE BOOK OF PHOTOGRAPHY. negative, using the positive plate in thecamera, as shown in Fig. 839. For thispurpose the twin lens camera used in theproduction of the original negative maybe employed, or, at any rate, the samelenses may be used. A table with a slotat A is provided, to which a box camera
. The book of photography; practical, theoretical and applied. uplicon (see Figs. 827 and 829) an ordinary half-plate printing frame is all that is needed,since no transposition is reciuired. Transparencies in the Camera. The second method of making stereo-scopic transparencies is by copying the C2G THE BOOK OF PHOTOGRAPHY. negative, using the positive plate in thecamera, as shown in Fig. 839. For thispurpose the twin lens camera used in theproduction of the original negative maybe employed, or, at any rate, the samelenses may be used. A table with a slotat A is provided, to which a box cameraB may be attached. A second box c isfurnished for the reception of the stereo-scopic negative at d, a partition is in-serted at E, and the inner sides of thenegative box blackened. The lenses ofthe copying camera at r G should beadjustable as regards their sensitive plate is situated at H h,and exposed in the usual manner, thenegative at d being illuminated by trans-mitted and diffused light. In the develop-ment of transparencies, softness and. L R. Fig. S40. Fig. 839.—Making Transparencies in the 840.—Principle op Elliotts Stereoscope. detail in the shadows should be aimed can be carried to a greater extentwith transparencies than with paperprints, since the means of their examina-tion (transmitted light) is powerful as com-pared with the weaker or smaller quantityof light that is reflected from a paperprint. Binding Transparencies. The binding-up of stereoscopic trans-parencies is a process similar to that of binding lantern slides, described inanother section of this book. It is ad-visable, however, in most cases, to usea semi-transparent glass for backing upthe picture, so that the light is nicelydiffused before passing through thepositive to the eyes of the semi-transparent glasses being acommercial article, the worker will haveno difficulty in obtaining what is may be introduced between thepositive film
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