Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

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64 MOTION PICTURE HANDBOOK the time, the same as the front one has, is the rule I have adopted. Of course, there is somewhat greater liability of breaking the back lens, since that gets the hottest, but the front one gets pretty hot, too. There is not so much dif- ference after all. I don't assert positively that I am right, but I think I am, and I'm not breaking many condensers either—maybe one in a month, maybe not so often. Keep your lamphouse clean and the rods it slides on well lubri- cated. Keep the screen which covers the vent holes clean. It clogs up rapidly with a fine, white ash, the residue of the water glass contained in carbon cores.