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58
BRITISH KINEMATOGRAPHY
Vol. 17, NO. 5
the picture, due to the Iconoscope characteristics, becomes intolerable.
Owing to the reciprocity-law failure of the emulsion, Eastman Fine Grain Sound Recording Safety Film, Type 5373, exhibits a considerable upturning shoulder characteristic, as shown in Fig. 15, when exposed by high-intensity radiation such as it receives from the rapidly moving, high intrinsic brightness of the Kinescope scanning spot. This emulsion shows no upturning shoulder characteristic when exposed by a low-intensity exposure such as the Eastman lib Sensitometer.
Additive Losses.
When made on film, Kinescope recordings are subject not only to a reduction in the resolution and luminance range of the television system, but also to those of the photographic process ; yet they must be projected back on to the television system for reproduction, thus suffering additional losses. It is obvious that programmes recorded by this technique suffer considerable degradation in quality, yet they do serve a definite purpose in organizing television programmes and networks that cannot be accomplished without resorting to direct photography, which would require different lighting techniques and would frequently necessitate duplication of the programmes.
BIBLIOGRAPHY
1. Janes, R. B., Johnson, R. E., and Moore, R. S. : " Development and Performance of Television Camera Tubes," RCA Review, X, No. 2. pp. 191-223, June. 1949.
2. Schade, C. H. : " Electro-Optical Characteristics or Television Systems, Parts I. II. Ill, IV.'" RCA Review, IX, Nos. 1, 2, 3. 4. March, June, Sept., Dec, 1948.
3. Rose, A. : " The Relative Sensitivities of Televi ion Pickup Tubes, Photographic Films, and the Human Eye," Proc. Inst. Radio Eng., 33, No. 6, pp. 293-300, June. 1942.
4. Zworykin, V. K., and Morton, G. A. : " Television." New York, John Wilev & Sons, Inc., 1940. •
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19. Mees, C. E. K. : "Theory of the Photographic Process," Chapter 20. New York, The Macmillan Company. 1942.
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21. Jones, L. A., and Higgins. G. C. : " The Relationship between the Granularity and Graininess of Developed Photographic Materials," J. Opt. Soc. Amer., 35, No. 7, pp. 435-457, July, 1945.