A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 129
A E For the perpendiculars to the three sides of a triangle from the oppositeangles intersect in the same point. (c.) If the line be inaccessible. 220. From the given pointC towards two visible points Aand B (Fig. 88) of the givenline range out CA and CB,and by one of the precedingmethods draw the… … 221. The preceding methods will apply in all the cases Sec. II.] FIELD OPERATIONS. 127 enumerated. They are, however, only to be considered assubstitutes for the neater and more accurate methods bvthe use of the theodolite or transit. Measurements suchas those directed above, when they are intended…
Surveying
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