A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 87
The reason of this is explained by the 84 SURVEYING. … We now read thedegree pointed outby the north end ofthe needle, and wefind it to be about50° on the arcbetween N and E,showing 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
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
