A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 137
FH4. When both ends are inaccessible. 241. Let AB (Fig. 102) be the in-accessible line. From any con-venient point C, run the lines CAand CB towards A and B, and, byone of the preceding methods, findCA and CB. In CA and CB, orCA and CB produced, take E and D so that CE : CA :: CD : CB. Measure DE.… … Then CE : CA :: ED : AB. D- Sec. IV.] KEEPING FIELD-NOTES. 135 SECTION IV. KEEPING FIELD-NOTES. 242. The operation next in importance to that of per-forming the measurements accurately is that of recordingthem neatly, concisely, and luminously. The first is arequisite that cannot be too much…
Surveying
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