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 53
Las a movable target wliicli carries a vernier, and•eadings to tliousaiidths. It cannot, however, be read with-out the aid of the target and is used for the most part,where precision is required; it probably commends its-self to a greater immbev of engineers, because of itsstiffness and wearing… … ^ «^ RED = 2 -4 = 6 8 91 Fig. .34.at the (ii-foot division,half and when bo extended the vernier is on each of the narrowsides, im])resKed in the wood (See Fig. 30). It should be notedthat while the vernier on the Philadel])hia rod i« situated ou the l-ig. 35. Fig. 36. The back of the rod slides…
Surveying
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