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 435
to the centrestake. 317. The Area of a Three-level Section.Let d and d be the distances out, and h and h the heights above grade of right and left slope-stakes, respectively;D the sum of d and d\c the centre height,r the slope-ratio,w the width of bed. 406 SURVEYING. Then the area ABCDE is equal to… … Fig. Equation (2) can also be obtained directly from equation (1) by substituting for h and h! in (1) their values in terms of . wa d and w, h = , and then putting D = d-\- dr. Equation (2) has but two variables, c and D, and is the most convenientone to use. 318. Cross-sectioning.—It will be seen…
Surveying
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