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 524
ss for the entire quadri-lateral. The spherical excess may be taken as 1 for each 75 square miles ofarea, and this is to be divided equally amongst the angles of the figure. GEODETIC SURVEYING. 495 been observed ; making, in all, seven geometric conditions tobe fulfilled. Only three of these… … choose the three which give the simplest equations, viz.: thatthe opposite central angles shall be equal, and that the sum ofall the angles of the quadrilateral shall be 3600. These giverise to the following equations : I(Alt B„ Ba, Cv etc., be the observed angles, and /„ /2, and /3the residuals in…
Surveying
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