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1954-55 Theatre Catalog, 12th Edition, Page 316 (280)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 316
Page 316

1954-55 Theatre Catalog, 12th Edition, Page 316

just as dirty, scratched, and misaligned optical equipment, deteriorated screen surfaces, and other manifestations of poor maintenance rob the theatre of the picture quality it could present to its patrons.

We believe that the performance of the drive-in theatres we measured is typical of such theatres generally, and

THE GIANT SIZE of the drive-in screens such as the one at the Air on O h . . I - I . , , N b., dithculty oi controlling outdoor lightmg, makes it important thgt everighigg gossibtlx:oh:) gill: nil:

that many theatres could noticeably improve their picture quality by giving more attention to equipment adjustment and maintenance.


Four important points which deserve attention in relation to the screen quality of projected pictures have been noted:

curb stray light eiiects. Use of good equipment. such as the Strong Super 135 lump (below) will help.

1. Screen quality is largely dependent upon the ratio of limits established between the screen brightness and the stray-light brightness of the screen. The results show that the stray-light ratio should not be greater than 0.3 per cent of the screen brightness for maximum picture quality.

2. Stray-light problems increase as screen brightness is lowered. It is important. not to attempt to expand the size of the projection screen very much beyond the light-output capacity of the projection equipment which will give a 10 ft-L screen brightness and/or to operate with projectors and screens in an unsatisfactory condition.

3. Dark scenes are alfected more severely by stray-light than light or normal density scenes. The presence of very dark scenes in motion pictures is of some concern to managers of drive-in theatres during periods of full moon, and where other forms of stray-light are a continual and often an uncontrollable problem. Those responsible for classrooms and auditoriums not equipped with the proper room-darkening facilities have available to them literature which will describe ways to help correct their situation.

4. A screen-brightness objective of 10 ft-L is obtainable practically in nearly every indoor theatre, auditorium, and classroom, but the'matte screen areas of outdoor theatres are so large that this brightness can rarely be obtained in a drive-in theatre. It is especially important for drive-in theatres that every eifort be expended to insure that all equipment is operating at its maximum ediciency.


1A report of the Committee on NonTheatrical Equipment, J. Soc. Mot. Prict. Eng., Vol. 37, pp. 22-69 (July, 1941).

2 Class-roomsy N0. 1 of the series. Planning Schools for Use of Audio-Visual Materials, Dept. of Audio-Visual Instruction, National Education Association, 1201 Sixteenth St., N.W., Washington, D. C., July, 1952 (see pp. 1-34).

3Tuttle, C. M.: Density measurements of release prints. Jomx Soc. Mot. Pict. Eng., Vol. 26, pp. 548-553 (May, 1936).

*Jones, L. A.: Interior illumination of the motion picture theatre. Trans. Soc. Mot. P/ict. Eng., Vol 10, pp. 83-96 (May, 1920).

SOHenhauser, W. H.: 16mm Sour/2d Motion Pictures. Interscience Publishers Inc., New York, 1949, 151; edition (see Chap. XIII, pp. 450-460).

'x I?ccomnLcnda-tions to P'roject'ionilsts for Theatre Screen Light Checking Pro('cdurc, Information Bulletin #6, 58. 099-51, 223, Motion Picture Research Council, Inc., 1421 North Western Avenue, Hollywood 27, California, (July 3, 1953) 22 pages.

7 Common Causes of Damage to 35mm Rclcnsc Prints, Motion Picture Film Department, Eastman Kodak Company, Rochester 4, N. Y.; 1952 (see pp. 50-54).

8Clark, L. D.: Picture quality of motion pictures as a function of screen illuminance. Jowr. Soc. Mot. Piaf. and Television Evy, Vol. 61, Part II: pp. 241-247 (August, 1953).

1954-55 Theatre Catalog, 12th Edition, Page 316