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 60
CALCULATING THE CONTENTFig. 48. 45 … 75. General Rule. When the given figure has many sides, withangles sometimes salient and sometimes re-entering, the operationsof reduction are very liable to errors if the draughtsman attemptsto reason out each step. All difficulties, however, will be removedby the following General Rule : 1.…
Surveying
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