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 134
ise of the stadia will now be deduced. Let O in Fig. 86 be the optical center of the object-glass oftlie telescope. This point may be assumed at the center of thehMs, and the error involved in such assumption is inappreciable■lad may be neglected. Lit SSi be a ijortion of the stadia rod covered by… … Pit;. 87. Call ? tho distance between the stadia hairs, s tlie interceptupon the rod, _/ the distance from O to tlie wires, and (/ thedistance of the rod from O. Tlie triangles COCi and SOtii are similar, and therefore w< havethe xiroportiou i: s :: / : afs therefore c? (») But/ varies with d.…
Surveying
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