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 71
vpill make the method of procedure apparent.Referring now to that figure, the first rod reading taken uponthe point A is ordinarily called a back-sight and the first read-ing taken upon B is called a -fore-sight. There seems to be nogood reason for adhering to this method of distinguishing… … FiK. AS. necessarily taken in front of the instrument. It is more logicaland less misleading to designate these rod readings by the termsplus-sight and minus-sight. A plus-sight, tlun-efore, is one taken upon a point of knownor assumed elevation, to determine the height of instrument. ,V…
Surveying
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