The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 441
writing itagain on the page. Example 2. Five-level Grottnd having four Warped Surfaces.—Find thevolume of a prismoid of which the following are the field-notes, the width ofbed being 20 feet, and the slopes i£ to 1: 11. 12. 28.9 + I2!6 27.1 150-j- 12.0 12.5 + 18.6 20.0-J- 21.0 18.5 43-Q-f- 22.0… … Let ABDGCFE be the cross-section. This may be separated into the tri-angle ABC, and the two quadrilaterals BCGD and ACFE. These areas areone half the areas of their enclosing rectangles, which areas are respectivelycw, kd, and kd. Therefore the area of the section is A = i(cw + &d+kd) (1) If…
Surveying
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