Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 272
new plane of reference above or below the previousone, must be determined in order to secure continuity of thework. 303. The following example will exhibit the method of re-cording the notes of a section level. The datum line is assumedto be thirty feet below the first bench. When the field-book… … Dist. + Sight. Ht. of Ins. - Sight. SurfaceHeight. GradeHeight, Remarks. Bench.01 1.637 31.637 1 / 2.1 1.8 30. 29.5 29.8 Bench on top of fence-post 30 ft. north of 0 stake. 160 0.9 30.7 2 3.4 28.2 3 10.8 20.8 T. P. 1.910 22.134 11.413 20.224 ! 4 5.8 16.3 5 9.0 13.1 , 5S0 10.4 11.7 6 9.8 12.3 7 10.6…
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