Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)
American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 57
ht toreach the eye of the observer, and is therefore betteradapted to precise leveling. At first some inconven-Fig. 40. ience is experienced by the fact that all objects arciipside down, but a little experience will soon con-viuce the observer that all the advantages whether for a four- 44 PLANE… … instrument it should be noticed whether the eye-piece is adjustedby a straight pull or by a spiral motion, because the spiral motionis usually considered more satisfactory. PLANE SrEYEYIXG 45
Surveying
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