A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 35
old may bebuilt of lighter material, being merely to support the observer andcarry the protection for the instrument from wind and sun. Bywrapping the scaffold with canvas while observing, the tripod maybe protected from the wind and sun as well as the instrument, thuspractically eliminating one of… … SIGNALS. 25 For the details of construction and outfit needed, see Coast andGeodetic Survey Report for 1882, Appendix 10, or 1893, pages406-414. Structures similarto Fig. 436 have beenraised to a height of152 feet and used verysatisfactorily. Figs. 437 and 438represent a convenientform of signal…
Surveying
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