442 



LIGHTING THE PROJECTION ROOM 



[On. 



the glare in the eyes of the spectators will detract from the effect. 



If ceiling lights are used they should be placed close to the ceiling 

 and on the side of the construction work (stringers, etc.) away from 

 the screen. Then the light will extend obliquely downward and 

 backward, but none of it will fall directly upon the screen. 



Lights along the sides of the room can be placed behind the 

 projecting construction work, or shaded so that the light cannot 

 extend toward the screen. 



FIG. 237. METHODS OF INDIRECT LIGHTING. 



(Cuts loaned, joy the National X-Ray Reflector Co.). 



A Shows an opaque bowl containing the electric light. The light is 

 reflected upward and is diffused throughout the room. 



B and C Illustrate the indirect lighting where the bowl containing the 

 electric light allows a certain amount of the light to extend downward. The 

 light is also reflected upward as in A. 



In C the bowl is cut away to show the electric bulb, the reflector for throwing 

 the light upward, and the opal glass diffuser below to give the soft luminous 

 effect of a very large source in the "luminous bowl." 



