. The book of photography; practical, theoretical and applied. Fig. 575.—Blue-Violet Teansparkncv. and using the same colour screens, theapparatus is greatly simplified, so thatonly two, instead of three, pairs of stereo-scopic images are necessary. One picture. 57(5.—The Ives Keomskop. is obtained thxough a blue-violet screen,one through a red, and two through greenscreens. This, of course, reduces the sizeof the plate necessary, enables the appara-tus to be of simpler construction, andrequires only one mirror instead of instrument and accessories are shownby Fig. 577 ; A is a frame c
. The book of photography; practical, theoretical and applied. Fig. 575.—Blue-Violet Teansparkncv. and using the same colour screens, theapparatus is greatly simplified, so thatonly two, instead of three, pairs of stereo-scopic images are necessary. One picture. 57(5.—The Ives Keomskop. is obtained thxough a blue-violet screen,one through a red, and two through greenscreens. This, of course, reduces the sizeof the plate necessary, enables the appara-tus to be of simpler construction, andrequires only one mirror instead of instrument and accessories are shownby Fig. 577 ; A is a frame containing the 428 THE BOOK OF PHOTOGRAPHY. three colour screens ; B is an attachmentwhich fits into the camera back, carryingthe colour screens and dark-slide whenmaking exposures; while c is the viewingapparatus itself. The process can beworked with almost any quartei- or half-plate camera having the focussing adjust-ment in front. The Joly Process. In the process introduced in 1895 byProfessor J. Joly, of Dublin, only onenegative is necessary. A taking screen is used, which is ruled closely with ex- ExposuRE, Development, etc. In making the exposure, an orthochro-matic screen is required to cut off theexcess of blue and ultra-violet rays. As,in addit
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