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CH. XII] DARKENING THE PROJECTION ROOM 443
The indirect or concealed light sources which have been recently developed answer all the requirements for suitably lighting a moving picture theater or, indeed, any other place where a soft light is required and the light should not shine directly in the eyes of the spectators (fig. 237 A, B, C).
It is also an advantage to have the screen in a kind of alcove i to 2 meters (3-6 ft.) deep and the walls on the sides, the floor and the ceiling dark brown or dark red or olive to absorb any light reflected upon 'them (6o6a).
For exhibitions, it also adds brilliancy to the picture to have a black border around the screen. It gives also the effect of a framed picture.
With such an arrangement of the lights in a suitably tinted room, no light will reach the screen directly to destroy the contrast and render the image vague. There can be sufficient diffused light in the room to enable one on entering to see the aisles and seats, and go about without stumbling. In a short time twilight vision will be established and it will then be possible to read or to take notes.
§ 607. Red lights near all exits. Fire escapes. — In public halls, and especially in moving picture theaters, it is an advantage, and often a requirement in city regulations, to have red lights near every exit so that the audience can see exactly where it is possible to get out of the hall.
The manager of every public hall should look to it every day that the fire escapes are in working order and before every exhibition that the doors or gates to the fire escapes are unlocked and easily opened.
§ 608. Relative darkness of the room for different kinds of projection. — The amount of diffuse light permissible in the pro
§ 606a. While it is a great help to have a screen in a dark alcove, still the general light of the room, although none extends directly upon the screen, tends, if too great, to make the image less brilliant and definite. Every one who has studied astronomy at all with a telescope knows full well how the defmiteness of the image of a nebula or dim star cluster diminishes when the moon rises and floods the heavens with its diffuse light. One can also see the effect of too much diffused light by observing a lighted clock face on a dark night, and the same face with the same light shining from it on a moonlight night or early in the evening twilight before complete darkness.