. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MACHINERY 227 lies in the wide furrow that it makes, with a slight ridge in the center. Definite experiments, as far as known, have not been conducted to prove any advantage of this kind of furrow. The shoe drill has been almost entirely displaced by the disk drill. It is a lighter draft type, and where penetration is not desirable it may be the type to select. The hoe drill has good penetration but ca
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MACHINERY 227 lies in the wide furrow that it makes, with a slight ridge in the center. Definite experiments, as far as known, have not been conducted to prove any advantage of this kind of furrow. The shoe drill has been almost entirely displaced by the disk drill. It is a lighter draft type, and where penetration is not desirable it may be the type to select. The hoe drill has good penetration but can not be used where there is any trash to contend with. Force Feeds. Two types of force feeds are used on drills. The most common is the external feed with a fluted seed. Fig. 139. The external force feed is shown at the left, and the internal device at the right. shell. The amount of seeding is varied by slipping the shell in a guard so as to expose in the seed cups more or less of the fluted parts as required. The second type is the internal feed with a ribbed ring to which the seed passes on the inside. This type does not vary the size of the cells on the ring, but the feed regulation is obtained by varying the rotative speed of the ring by a change of gears. Usually two sizes of seed cells are provided in the ring, one for small seeds and one for large seeds. The internal feed is the best type for drilling. 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 Davidson, Jay Brownlee, 1880-1957. St. Paul, Minn. , Webb Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
