. 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. SURVEYING 37 Second Method: If the side of the irregular field is not of such a character as to be readily divided into large trapezoids, then the offsets may be taken at regular intervals along the base line. If d be the regular interval between offsets then the area of the trapezoid whose sides are h and h' is equal to one-half their sum mul- tiplied by d, or Area abcd = ^ Qi-\-h') PROBLEMS 1. What is the
. 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. SURVEYING 37 Second Method: If the side of the irregular field is not of such a character as to be readily divided into large trapezoids, then the offsets may be taken at regular intervals along the base line. If d be the regular interval between offsets then the area of the trapezoid whose sides are h and h' is equal to one-half their sum mul- tiplied by d, or Area abcd = ^ Qi-\-h') PROBLEMS 1. What is the area in acres of a rectangular field whose length is 1320 feet and whose width is 347 lA feet? 2. How many acres in a field 80 chains long and chains wide? 3. What is the area in square feet of a triangular piece of ground, if the length of one side is 339 feet and the altitude on this side as a base is 92 feet? 4. The length of the sides of a tract of land in the form of a tri- angle are 220,310, and 343 feet. What is the area in acres? 5. The four sides of a trapezium are 420, 417, 380 and 375 feet taken in order around the field, the diagonal from the corner between the 417 and the 380 foot sides to the opposite corner is 528 feet. Find the number of acres in the tract. 6. Find the acre area of a road 66 feet wide and 3960 feet long. 7. Find the area in square feet of a tract of land with an irregular shaped side if offsets taken at the regular interval of 50 feet are 0, 25, 30, 28 and 50 feet, respectively. 8. How many rows of corn 3 feet 6 inches apart can be plaDted in a field 20 rods wide? How many hills of corn 3 feet 6 inches apart will there be in the field if it be 80 rods long? 9. How many apple trees 20 feet apart may be planted in a 1-acre tract in the form of a square? Try a different arrangement of the trees. 10. At this point the student should be prepared to take up the problem of surveying, mapping, and calculating the area of certain tracts of land, a
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