A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 89
84 SURVEYING … We now read thedegree pointed outby the north end ofthe needle, and wefind it to be about50° on the arcbetween N and Etshowing that thecourse or directionfrom the center of thecompass to B is Northabout 50° toward theEast — a result obvi-ously true. Turning the sight-vanes toward thenorth west will…
Surveying · Navigation
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