A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 257
wood of the rod. A circular level attached tothe back of the rod enables the rodman to keep it in a verticalposition. The face of the rod is divided, by painting black andwhite, into centimetre divisions to serve for telemeter readings, andalso to check the rodmans reading of the rod. The bottom of… … RODS. 247 Fir,. 4R0. The most important feature of this rod is its preparation forprotection against the action of moisture. Hitherto the principalobjection to wood for measuring rods has been its action undervarying conditions of moisture. Although painted, oiled, var-nished, or otherwise treated,…
Surveying
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