A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 230
when the divided circle is turned round on its axis. Ifnot, the axes of the two plates are not parallel to each other. Thedefect can be remedied only by the maker; for, if the bubbles bealtered so as to be right for this reversal, they will be wrong forthe vernier-plate reversal. 323. Second… … with a nail driven into its head, or a chain-pin, as far from theinstrument as it is distinctly visible, as at B. Direct the telescope 216 LAND-SURVEYING. to it, and fix the intersection of the cross-hairs very precisely uponit. Clamp the instrument. Measure from A to B. Then turnover the…
Surveying
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