CH. XI] TROUBLES WITH MOVING PICTURES 437 



to the open air outside the building; (3) all the openings in the 

 operating room must be closed by fire-proof shutters the instant a 

 fire starts. In this way the smoke and gases will escape through 

 the flue, and no one in the audience will know that anything is 

 wrong. 



From the standpoint of the operator, if a fire should start he 

 should turn off the arc light and turn on the room lights as soon as 

 possible. If there is a pail of water or a small fire extinguisher 

 of the wet form in the room the water or the fire extinguisher can 

 be used to good advantage to prevent the fire from spreading. 

 The cooling effect will sometimes put out the film, although, as 

 stated above exclusion of oxygen does no good for the celluloid 

 contains enough oxygen to support combustion. The real way 

 after all is to be so careful that a fire never starts. (See Richard- 

 son's Handbook, zd edition, pp. 65-93). 



