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170
BRITISH KINEMATOGRAPHY
Vol. 17, NO. 5
when the projectors are standing side by side. Then these main controls are left alone, and the pictures merged by the adjustments on the lenses.
Although complicated when described, this setting-up is simple in practice, and is greatly assisted by the remote control facility and talk-back from the desk at the camera. It is normal for two pictures to be perfectly merged within ten minutes of switching on the projectors, and triple-head work takes only a little longer.
The amount of cross-movement available on the objective lens is sufficient to give perfect correction from keystone effect on double-head pictures of \2h ft. width, or over — this is irrespective of the focal length of the objective lens ; for triple-head work perfect correction is obtained on pictures 25 ft. wide or more. On rather smaller pictures the faulty definition introduced by keystoning could probably often be tolerated. The lenses have all been tested in the extreme offset condition : the effect on the resolution and distribution of illumination is too small to be visible at the camera, except in the case of the 6.4 in. lens, and then the fall-off would probably not matter in most shots.
Fig. 7. Central part of optical bed, with cover remov2d. Left, water-cooled No. I lens projecting into lamphouse ; centre, one of the relay condenser lenses, and dim-oat shutter ; right, slide holder
with its adjustments.
REFERENCES
1 . Recent Developments in Carbon Arc Lamps. b\ C. C. Hevs-Hallett. Brit. Kine, 11. Dec. 1947. p. 188.
2. The Heating of Film and^Slides in Projectors, bv Hush McG. Ross. Brit. Kinc. 16, Feb.. 1950, p. 38.
3. Protected by Patents.
4. Recommendations on Process Projection Equipment. J. Soc. Mot. Pict. En?., 32, June. 1939, p. 589. Paramount TripleHead Transparency Process Projector, by F. Edouart. J. Soc. Mot. Pict. Eng., 33,
Aug., 1942. p. 171. Developments in TimeSaving Process Projection Equipment, by R. W. Henderson, J. Soc. Mot. Pict. Eng., 34, Oct., 1942, p. 245. The Paramount Transparency Projection Equipment, by F. Edouart, /. Soc. Mot. Pict. Eng.. 40, June, 1943. p. 368. High-Efficiency Stereopticon Projector for Color Background Shots, by F. Edouart. /. Soc. Mot. Pict. Eng., 43, Aug., 1944, p. 97. 35-mm. Process Projector, bv H. Miller and E. C. Manderfield. J. Soc. Mot. Pict. Eng., 51, Oct., 1948. p. 373.