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 344
efficient to reduce these to the mean velocityin a vertical plane; Ax, A„ Az, etc., the partial areas of the cross-sectioncorresponding to the observed velocities Vx, V„F3, etc.; A the total area of the cross-section = Ax -f- A2 -f- Az1etc.; Qv Q» Q*> etcv the partial discharges; Q the total… … Fig. 8a. 316 SURVEYING. It has been here assumed that observations are made at butone point in any vertical plane. The method is the same, how-ever, in any case, it only being necessary to apply such a co-efficient to the observed velocity as will reduce it to the meanvelocity in its own sub-area.…
Surveying
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