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 590
s is that set the sum ofwhose squares is a minimum. If the system includes morethan a few polygons, this method of reduction is exceedinglylaborious, while the increased accuracy is very small over thatfrom a much simpler method. Fig. 150 represents the Bavarian network of geodetic levels,there… … Fig. 150. tion on each polygon shall sum up zero. When these sumsare taken the following residuals are found : I., -|- 20.2mm ; II.,+ 39-3mml HI., — 25.2mm; andIV., + io8.0mm. It was sup-posed that an error of one deci-metre had been made in thefourth polygon, but in the ab-sence of any knowledge…
Surveying
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