A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 146
s, and tldrdly^the letter, E or W, of the 90° pomt which is nearest to the sameend of the needle. Thus, in the figm-e, if when the sights W3redu-ected along a hne, (the Northpoint of the compass being mostdistant from the observer), theNorth end of the needle was at thepoint A, the bearing of the… … 164. —-B (236) We can now understand why W is en the right hand ofthe compass-box, and E on the left. Let the direction from thecentre of the compass to the pointB in the figure, be required, andsuppose the sights in the first placeto be pointing in the direction of theneedle, S N, and the North…
Surveying
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