A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 77
ing oneend of the tube, and the rest of the way, by the parallel plate-screws. Again, turn the plate half-way around, and repeatthe operation, if necessary. The other tube must be tested,and, if necessary, adjusted in the same way. Second Adjustment. To cause the line of collimation torevolve in a… … Clamp the instrument so that there can be no movement hori-zontally, turn the telescope over, and fix another point (as a nail METHODS AND INSTRUMENTS. 59 driven in a stake) precisely in the line of sight, and at anequal distance from the instrument. In the figure let A be the place of the…
Surveying
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