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 28
10 LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. Fig 10. the vertical plane of section by which the cylinder was cnt informing the aperture. The edge of the mirror is marked thus(x) in the first half of Fig. 9. The mirror is made to hangplumb by means of a one-sided weight within the cylinder. This…
Surveying
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