A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 88
Sec. V.] INSTRUMENTS AND FIELD OPERATIONS. 85 THE THEODOLITE. Fig. 52. … 86 PLANE TRIGONOMETRY. [Chap. Ill, can readily be pointed to any object. The second describedplate has an index of some kind, moving in close proximityto the divided arc, so that the relative position of the platesmay be determined. If then the telescope be directed toone object, and afterwards be…
Surveying
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