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 70
on line from Ji. to C) in some position such thatthe line of sight will strike the rod as near its foot as it is pos-sible to take a reading: send the rod to some point I! such thatthe line of sight will strike the rod near the top when extended.The difference of these rod readings will give the… … Pig. 47. ings upon A and B will give the difference of level of A and V.proper attention being given to signs. If the line of levels is very extended the abov^e method isawkward, as some of the differences will be positive andsome negative. Choose some plane called a datum plane, suchthat all of…
Surveying
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