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 85
by theadjoining figure ; we require .thefine AB, and not the fine alongthe ground as AC. AB=ao-\-cd-\-fC. It is not only necessary tomeasure lines but we must alsoknow their direction or the angleswhich they make with the meridian. This is commonly determined by means of thesurveyors compass. The… … MENSURATION OF LANDS 83 position and the needle free to move on the center, the needle willkeep the magnetic meridian, and the circular plate may be turnedunder it to bring the sight-vanes to any line; — the needle will thenpoint out the degree of inclination which the line makes with themeridian.…
Surveying · Navigation
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