A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 87
upper platecan be turned freely about their common centre. Thisplate carries a telescope Q, resting on two upright supportsKK, upon which it is movable in a vertical plane. Thetelescope, having thus a horizontal and a vertical motion, * The author is indebted to Professor Gillespies Treatise on… … Sec. V.] INSTRUMENTS AND FIELD OPERATIONS. 85 THE THEODOLITE. Fig. 52.
Surveying
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