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582 H. RUBIN [j. s. M. P. E.
short, no factor related to presenting the program to the audience should be considered as being outside the province of the Supervisor, or to be disregarded by him.
Thorough supervision requires the making of periodical theater inspections, on which occasions the Supervisor would naturally look for any apparent screen faults, such as an unsteady picture, travelghost, uneven or poor screen illumination, scratched film, or oily film. He would, no doubt, obtain a great deal of information by observing the picture as projected on the screen. He should also note the condition of the picture screen. Innumerable other details will require his attention, such as checking of projector components for vibration wear, adjustments and tensions imposed on the film ; the noise levels of projectors; equalizing the sound and the light outputs of projectors; determining the overall frequency response of each sound channel; examination of arc voltage and amperage; inspection of feeding mechanisms and lamp houses; examination of wire connections, fuses, and switches; determining whether or not undue heat develops in any of these items or its connections; checking the condition of theater reels, rewinders, and film cabinets; checking the condition of projector gears, shafts, and bearings, their lubrication and cleanness; checking the amount of backlash between the shutter and the intermittent sprocket; checking the condition of motorgenerator brushes, brush rigging, commutator, bearings, end play of shaft, level position, lubrication, and cleanness. To list every possible fault which might develop in each item of equipment would serve no practical purpose here. A few of the most prominent points have, however, been listed above in order to indicate the extensive inspection and checking required.
The Supervisor will naturally direct his efforts to prolonging the life of the release prints. Most instances of film damage can be directly attributed to lack of supervision, to having permitted equipment wear to develop to the point where damage to the film is inevitable, to faulty adjustment of projector parts, to excessive tension in the film or to plain stupidity concerning the handling of film. Usually film is not taken out of service because the sprocket-holes have become so worn that the further use of the film would be hazardous. More frequently the film is retired because it has become so badly scratched and soaked with oil that its entertainment value has declined to the vanishing point. Scratching of film, together with the second notorious trouble, oiliness of the film, may be reduced to a