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 666
iameters : a = 6 378 206 metres,b = 6 356 584 or a : b :: 294.98 : 293.98. See Appendix No. 7, U. S. Coast and Geodetic Survey, for tabularvalues of constants and forms for reduction. TABLES. TABLE I. Trigonometric Formula. Trigonometric Functions. Let A (Fig. 107) = angle BAG = arc BF, and let the… … Fig. 107. In the right-angled triangle ABC (Fig. 107)Let AB = ctAG = 6, and .BC = a.We then have: 1. sin A 2. cos A 3. tan .4 4. cot ^4 5. sec A — = cos Bc = sin B = — = cot i? = — = tan Ba — cosec B 6. cosec A = — = sec B a 7. vers 4 = = covers B i. exsec A = —,— = coexsec Bo 9. covers A = versin…
Surveying
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