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 437
Fig. 112. Equation (2) can also be obtained directly from equation (i) by substituting for k and k^ in (i) their values in terms of , wa d and w^ h ^=^ , and then putting D ^:=^ d-\- d. Equation (2) has but two variables, c and D, and is the most convenientone to use. 318. Cross-sectioning.—It will…
Surveying
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