. 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. 200 AGRICULTURAL ENGINEERING the furrow slice of tough sod gradually; second, the general- purpose plow, to be used for general plowing in stubble and light sod; and, third, the stubble plow, with an abrupt mold- board for pulverizing the soil, used only in old ground. Among these three classes there are numberless shapes of plows difficult to classify. ^ Fis 108. The three principal types of plows, showing
. 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. 200 AGRICULTURAL ENGINEERING the furrow slice of tough sod gradually; second, the general- purpose plow, to be used for general plowing in stubble and light sod; and, third, the stubble plow, with an abrupt mold- board for pulverizing the soil, used only in old ground. Among these three classes there are numberless shapes of plows difficult to classify. ^ Fis 108. The three principal types of plows, showing in order the stubble, the general purpose, and the prairie breaker plows. Construction. The moldboard may be made of soft- center steel or chilled iron; but the latter is used but very little in the Middle West, where the soil is of such a character that the hard-tempered surface of the soft-centered steel is required to scour properly. Certain localities are furnished with plows with common cast-steel moldboards; but they can not be used where many rocks are encountered, in which case a soft share, at least, must be provided. The wearing properties of the soft-centered steel share is secured through its hardness; but to secure hardness a certain amount of brittleness must remain, even with a soft center to the metal. Adjusting the Walk- ing Plow. The walk- ing plow must have its point turned down slightly in order to cause the plow to take to the ground. This gives what is called ' 'suction'' to the plow, and is resisted by the upward pull of the draft. It is imperative that the suction be sufficient, and quite as important that. Fig. 109. A steel beam walking plow of the general-purpose 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
