The paper presents results of the studies dealing with evaluation of the horizontal projection of the trajectories of the tubers soiled to various degrees which were fed by rotary elevating drum on the Packman and Peis separators. Process of feeding separators with the crops of two levels of soiling was registered on the film by the Krasnogorsk 16 and Pentaflex AK 16 motion picture cameras and by the stroboscope method using still camera. There has been stated a decreased value of range of the horizontal throw of the tubers soiled at the surfaces in the range 7-11% when compared with the tubers soiled within the range og 1-3%. These differences are statistically significant. The decreased range of the throw of the tubers is the factor which can unfavourably affect uniform distribution of material separated by the separators of the machines harvesting potatoes.
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