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 657
uccessive differential coefficients of / withrespect to s is the most difficult portion of this general development. Ifs be supposed to vary, then /and z both must vary, and they are all im-plicit functions of each other. These coefficients are therefore best / found geometrically, as follows : In… … Then CP = EP = / - dl - dl. Let angles PAB — z and PBC = z. Since the line s is a straight line upon thesurface of the sphere (lies in the plane of a greatcircle), the angle z is greater than the angle zby the amount of convergence of the meridiansAP and BP at that point. This convergenceis the…
Surveying
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-273-178.webp)
