The motion picture projectionist (Nov 1930-Oct 1931)

December. 1930 Motion Picture Projectionist 45 Film Mutilation (Continued from page 43) Care should be taken to see that they revolve freely as a sticking roller can cause bad emulsion scratches especially if it is worn, thereby allowing the center of the roller to come in direct contact with the face of the film. This is especially true of the upper magazine rollers around with dirt and small pieces of film very often accumulate. Adjustment of Film Trap Door On one make of projection machine the film trap door is designed so that it can be easily removed by merely lifting it from its holder. In replacing this film trap door care should be taken to see that it is seated properly, as unless this is done one is liable to ruin the intermittent sprocket, bend the shaft as well as ruin the film which happens to be running through the projector at the time. Strippers on Sprockets On some projectors, so-called strippers or stripping plates are provided to prevent, by any chance, the film from winding around or "following" the sprockets as well as to remove any accumulation of dirt that may tend to form at either side of the sprocket teeth. In resetting these strippers after the replacement of sprockets, extreme care must be taken to see that they do not come in contact with the teeth as this will cause the teeth to wear to a sharp edge which will damage any film coming in contact with it. Unnecessary Oiling Flooding the mechanism with oil is unnecessary and causes oil to get on the film. Dust then adheres to the film making good clear projection impossible. This practice also is a fire hazard as oily film will catch fire a great deal easier than that which is clean. Aside from the intermittent case, one drop of good oil in each oil hole will be sufficient for the average day's run. Tracing Film Damage Film damage can sometimes be more easily traced if it will be remembered that certain projectors run the film emulsion or dull side against all three sprockets, while on others the support or shiny side, only touches the sprockets. For example; if film is received showing tooth marks on the emulsion side, it is fairly simple to determine on what make or makes of projectors this film has been run, especially if the investigator has familiarized himself with the different types of sprocket teeth. Film Should Be Waxed In making the new films attention is drawn to the desirability of waxing new prints along the perforations HIGH INTENSITY SPOTLIGHT MORE AND BETTER STAGE LIGHTING AT LESS EXPENDITURE OF ELECTRICAL ENERGY. MOST REMARKABLE RESULTS ON LARGE STAGE SETS. HALL & CONNOLLY, INC. 24 Vandam St. New York, N. Y. SYNCROFILM Sound Head for Simplex is not claimed to be the best sound equipment in the world. We do not know who makes the best. We do know that your patrons will be pleased with the sound in your theatre if equipped with SYNCROFILM Simplicity of Design. Trouble-proof operation. Easy to install and Low Cost are SYNCROFILM Features. Can easily be fitted to your present disc equipment. WEBER MACHINE CORP. Pioneers in the sound field 59 RUTTER ST. Export Department 15 Laight St., N. Y. C. ROCHESTER, NEW YORK Cable Address "ARLAB" New York