. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 927, U. S. DEPARTMENT OF AGRICULTURE. so slight that the extra handling would be unprofitable. However, such treatment seems to be necessary in order to make the subsequent drying by the rotary drier successful. If the seed contains more than 52 to 55 per cent of moisture, it has a tendency to pack and stick to the walls of the drier instead of drying and discharging freely. In the experiments conducted none of the expeller or centrifuged seed packed in the drier, but in every case the untreated seed did pa
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 927, U. S. DEPARTMENT OF AGRICULTURE. so slight that the extra handling would be unprofitable. However, such treatment seems to be necessary in order to make the subsequent drying by the rotary drier successful. If the seed contains more than 52 to 55 per cent of moisture, it has a tendency to pack and stick to the walls of the drier instead of drying and discharging freely. In the experiments conducted none of the expeller or centrifuged seed packed in the drier, but in every case the untreated seed did pack. An experimental direct-heat drier (fig. 8) was installed for the work, the heat being supplied by gas. The seed-drying chamber of this machine was 5 feet long by 1 foot in diameter and rotated at. Fig. 8.—An experimental direct-heat drier. the rate of 16 revolutions per minute. About six or seven minutes were required for the seed to pass through the machine. Inasmuch as this period was too short for complete drying, several passages through the drier were necessary. Trials on a semicommercial scale demonstrated that such a machine is readily adapted to the drying of such material as washed tomato seed, since it is easily controlled, is continuous in operation, and carries a minimum labor charge because it requires but little attention. In order to produce seed of proper dryness it was necessary to pass it through the machine three times. The moisture content, whirl) at the beginning was per cent, at the end of each passage. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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