47* DO AND DO NOT WITH ROOMS AN D SCREEN’S [Ch. XII § 642. Summary at Chapter XII : Do 1. Use a room property equipped for projection if good results are expected <§ 602). 2. Use light-absorbing tints for tinting and decorating the projection room !§ 604). 3. Make all paints dull or flat, never shiny, for a projec¬ tion room. 4. Light the projection room sufficiently, so that the specta¬ tors can find their seats without trouble (§ 605). 5. A perfectly darkened room is only necessary for special projection (§ 608). 0. Lamps for general lighting should be shaded or so arranged that their light cannot shine directly in the eyes of the spec¬ tators or upon the image screen t§ Ooöh 7. Have red lights near all exits t§ 607). 8. Take the necessary pre¬ cautions to prevent light enter¬ ing the rxxmi at the edges of the window shades (§ 611). Do Not 1. Do not expect good pro¬ jection in a room not equipped for it. 2. Do not use light-reflecting colors like yellow, white, light red or green for decorating the projection room; but the dark. rich, light-absorbing col¬ ors. dark red, brown, etc. 3. Do not use paint that gives a shiny or enamel surface, for this will produce a glare by the reflections. Use flat paint. 4. Do not have the projection room darker than necessary. 5. Do not attempt the most difficult projection unless the room can be made perfectly black. 6. Do not use unshaded lamps for the general lighting. Light shining directly in the eyes of the spectators is very distressing. 7. Do not fail to have red lights by the exits. 8. Do not leave the window shades without protection at the margins.