Measures length and width of material to be copied, using rule. Computes percentage of enlargement or reproduction necessary, using chart or percentage scale. Mounts material on easel beneath lens, turns on light, and moves controls to focus lens on material. Estimates exposure time, according to size of lens aperture, grade of sensitized paper, and intensity of light.
Places filter over lens to make color separation when copying color work.
Sets automatic timer and starts exposure. Rolls exposed section of sensitized paper into developer tank inside machine and presses lever to cut section from roll. Examines print for sharpness of line. Rinses developed print in water and places print in heated drying cabinet, between blotters, or on heated cylinders of roll-dryer. Trims excess margin from dried print, using cutting blade.