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 197
hows one form of construction of the plane tablewith leveling screws and Fig. 124« shows a plane table with a muchsimpler form of leveling head. This latter was designed by Mr.W. D. Johnson and has received the approval of the topographers 176 PLANE SURVEYING of the Tnited States Geological Survey.… … Fig. 124. Place the ruler upon a smooth surface, and draw a line along itsedge, and also lines at its ends, lleverse the ruler on these lines,and draw another line along its edge. If these two lines coincide,the ruler is straitrht. PLANE SirKVEYrNC4 m 2nd. To maJie the jilaiic of the tahle…
Surveying
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