Movies for TV ([1950])

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FILM TRANSMISSION EQUIPMENT 121 diffusing the light to the dark areas and preventing sharp focus. Strange as it may seem, one or two deep scratches are much less detrimental than the multitude of small scratches produced by the methods mentioned above. Never handle the lens elements and keep fingers off the lenses. If the film channels are not kept clean, little mounds of hard emulsion scraped off the film by its passage through the projector begin to build up. Often called horns, these can ruin a new film in one projection by causing deep scratches.