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 44
h iron,and connected by joints at thetop. There are many differentforms, the most common of whichis given in Fig. 19. Other formsare given in Figs. 26, 28, and 29.Lightness and stiffness are the de-sired qualities. Of the two rep-resented in Figs. 28 and 29, thefirst has the advantage of… … CHAPTER Y. (46. Fig. 33 Fig. 31 a EODS. ) These should be made of light, well-seasoned wood.A plumb or level attached to them willshow when they are held vertically. Todetect whether the rod leans to or from theinstrument, its front may be angular orcurved. If angular, when held leaning tow-ard the…
Surveying
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