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SCREENS
165
being the best for coating when the job is undertaken by the theatre. (69) If paint is to be used, try a small section at one of the bottom corners. If it adheres, apply it as suggested below. (70) If it doesn't adhere, wash it off carefully with a soft rag dipped in turpentine. Try shellac the same way. If it sticks, apply a thin veneer all over the screen surface, let it dry and then apply a thin coat of paint.
(71) When coating a perforated surface, the perforations can be kept partially free with the aid of a suction hose attached to a vacuum cleaner operating on the other side of the screen, working in time with the movement of the brush. The regular dust bag of the vacuum should be replaced by gunny sacking. If there is no room for the operation back of the screen, the screen should be dismounted and stretched on a temporary frame. (72) A spray gun for the resurfacing job is much better — it will not clog up the perforations as much as a brush does. In any case, the size of the holes must not be decreased or it will have a bad effect on the sound.
If kalsomine is used instead of paint follow the same general method but apply thin coats only. Never put heavy coating on perforated surfaces.
Screen Sizes
(73) The Projection Screens Committee of the Society of Motion Picture Engineers suggests the following screen sizes as best for present-day projector aperture dimensions. The height and width are as 3 and 4. For an 18 degree projection angle such a screen will require a minimum of masking.
TABLE NO. 7. SCREEN
SIZES
8' X
6'
14' X 10' 0"
20' X 15'
9' X
6' 9"
15' 11' 3"
21' X 15' 9"
10' X
7' 6"
16' X 12'
22' X 1<>
11' X
8' 3"
17' X 12' 9"
23' X 17' 3"
12' X
9'
18' X 13' 6"
24' X 18'
13' X
9' 9"
W X 14' 3"
25' X 18' 8"
(74) Authorities believe that the auditorium illumi