ABSTRACT A research technique has been designed and developed to quantitatively analyze spray deposit across the spray swath. Unique features of the method are that automation has been employed to reduce the number of personnel previously required to perform the same chore and that a hard copy of descriptive statistics and data plots is available within 3 min after a swath is sprayed. In operation, spray passes with dyed water are made over a 35-mm film sampling surface. A custom made extruded aluminum tubing surface is used to support and hold the film in a dove-tail slot. The clear acetate film is a continuous strip 3.5 cm wide by 304.8 m long. A film drive system pulls the sprayed film through a wash-cell. A calibrated colorimeter monitors optical density of the effluent. The colorimeter output is stored in a microprocessor for subsequent data analysis. The microprocessor is currently programmed to provide mean spray deposit, total swath width, swath width at the mean deposit level, standard deviation, coefficient of variation, percent recovery, and lateral spray mass displacement. These parameters, along with a plot of the spray distribution pattern, are printed out at the field test site. The systems quantitating feature permitted a demonstration of how large sampling errors can be with such a spray collection technique. These errors effectively reduce the quantitating utility of the system and highlights the complexity of spray deposit analysis.