Abstract
The first part of this paper is a description of artificial lighting units designed to give a suitable illumination for grading grain. Two types of illumination are being tried; first, the imitation of daylight by means of daylight lamps; second, the use of colored lights which emphasize the bad and good points in wheat. A combination of a mercury lamp, neon lamp and the General Electric type S1 sun lamp gives promise of being a satisfactory source of illumination of the second type. A grain grading unit of each type is being given a prolonged trial.The second part describes experiments which were an attempt to find a more objective means of grading wheat. The light reflected from wheat of different kinds and different grades was analyzed both spectroscopically and by means of a photo-electric cell and light filters. In the spectroscopic measurements ultraviolet light was included. The results indicate a certain amount of selective reflection but the variations with the different grades are not of a nature which would be helpful in grading wheat.
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