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 178
sticks, which form a tripod, framed with the signal-staff, by abolt passing through their ends and its middle. Fig. 201represents the signal as framed on the ground; Fig. 202 showsit erected and ready for. observation, its base being steadiedwith stones; and Fig. 203 shows it with the staffturned…
Surveying
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