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 46
rror being perceptible. The next three,Figs. 35, 36, and 37, depend upon the nicety with which theeye can determine if a line bisects an angle. Fig. 38 dependsupon the accuracy with which the eye can bisect a space.Fig. 39 depends upon the accuracy with which the eye canbisect a circle. Figs. 36,… … should be used, on account of its being leastaffected by moisture. (48.) Verniers. L. S. [343-357]. The targetcarries a Vernier, by which smaller spaces maybe measured than those into which the rodis divided. It may be placed on the side of anaperture, in the face of the target, throughwhich the…
Surveying
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