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 429
tain a new set of curves, shown in the figure by dotted lines,which may be used for estimating the amount of earthwork.The dotted boundaries are the traces on the natural surface ofplanes parallel to the final graded surface which are uniformly 4oo SURVEYING. spaced one foot apart. These areas are… … the slope here being vertical. For any two adjoining layerswe have, by the prismoidal formula* as well as by Simpsonsone-third rule, VI.3=^(Al+4A, + At), (i) where h is the common perpendicular distance between thesections. * For the demonstration of the prismoidal formula see p. 403. THE…
Surveying
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