Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 266
hts. Before going on the field with the level, rule three columns,as below, and head them, stations, back-sights, fore-sights. SEC. III.] LEVELING IN THE FIELD. 259 FIELD NOTES. Stations. + Back-Sights. — Fore-Sight3. 1 10 3 2 11.6 0 3 6.8 4.9 4 3.9 8.3 Sums . . . 32.316.2 16.2 Dif. of leve I . .… … Place a leveling rod at A. Make the level horizontal by meansof the leveling screws; turn the telescope to the rod at J, anddirect the rodman to raise the target until the horizontal line 360 ELEMENTS OF SUKVEYII^G. [BOOK VII. ah pierces its centre; then note the distance Ah (equal to 10feet in the…
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