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 318
one or both sidesof the river. The soundings can then be made at the samepoints continuously without having to observe any angles atall. Such a system of ranges is shown in Fig. 72. AAf andBB are range-poles on the section line. O and O are tallwhite posts set at convenient points on opposite sides… … Fig. 72. BB will locate the soundings at 1, 2, etc., on this section line.The posts in the banks should be marked by strips nailed uponthem so as to make the Roman numerals as given in the figure.Such a system of ranges as the above is useful also for fixingpoints on a section-line, for setting out…
Surveying
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