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 457
West Base Morgan-Park Fig. 117.* 600 miles apart. In general, in primary work, the distanceapart has been about one hundred times the length of thebase. Secondary bases are from two to three miles in length, … Lombard ^1_____i____ ^^ c HIC AGOShot Tower \ I ^m West Bas^e _ ist BqsWillow Springs Bald Tom Michigan CitySpringvilte Otis Fig. 118.* and from fifty to one hundred and fifty miles apart, the dis-tance apart being about fifty times the length of base. Ter-tiary bases are from one half to one and a…
Surveying
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