A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 477
rences to such authorities as willenable the student to further inves-tigate the subject. Field-Work.686. Reconnaissance. The firststep in making a geodetic survey isthe selection of a series of points.A, B, C, etc. (Fig. 517), as the basisof a system of triangulation. Incase the country is broken… … See Report of Coast and Geodetic Survey, 1S68, 1876, 1880, 188$ SPHERICAL SURVEYING, OR GEODESY. 463 is 192 miles in length. It is in general advisable to choose thepoints so that the resulting triangle sides are as nearly equal aspossible. To do this, it may be necessary to build towers or…
Surveying
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