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 521
1) 492 SURVEYING. We would also have A+a=A; B, + b,=B; C + c=C, where ar, b\ and c are small corrections to the measured values A, B\ and C which are to bedetermined. Let us suppose that the length ofthe side b has been exactly meas-ured,* then when the true values ofthe angles are found we may… … C = b sin (C+ c1)sin (B + b) (2) Again, if the side a had been measured and its exact lengthfound, we would obtain the third condition equation, A.= b sin (A+ of)sin {B + V) * (3) We now have three independent equations involving threeunknown quantities, and can, therefore, find the quantities a\b\…
Surveying
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