. 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. 36 AGRICULTURAL ENGINEERING It is to be noted that if a point within is taken as the apex of all the angles, it would be necessary to measure, either all three sides of each separate tri- angle, or one side of each as a base, and the altitude. Second Method: (Figs. 22 and 23.) The area of a many-sided figure may be obtained by dividing the field into parallelograms formed by dropping a perpendicular
. 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. 36 AGRICULTURAL ENGINEERING It is to be noted that if a point within is taken as the apex of all the angles, it would be necessary to measure, either all three sides of each separate tri- angle, or one side of each as a base, and the altitude. Second Method: (Figs. 22 and 23.) The area of a many-sided figure may be obtained by dividing the field into parallelograms formed by dropping a perpendicular from each corner to a base line projected either across the field or on one side. It is to be noted that all parallelo- grams which are entirely outside of the field are negative areas, and their sum should be subtracted from the sum of those having a part of their area inside of the field. Figures With Irregular Sides. First Method: The area of a field with an irregular side like that formed by a stream may be obtained by considering the irregular side to be formed of short straight lines, and measuring offsets, or per- pendiculars erected from a base line to points in this broken line so as to form trapezoids, whose areas are easily 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
