Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 234
nsit. Leveling Rod. There are several kinds of leveling rods,each possessing some merit peculiar to its purpose. The oneshown in Fig. 19 is known as the Philadelphia leveling rod,and is the one in most common use. It is made of two piecesof wood, sliding upon each other, and held in position by… … Fig. 18. The Y Level 246 SURVEYING and it also has a scale by which the rod is read to half humdredths of a foot as it is extended. The targetslides along the front of the rod and is held inplace by two springs which press upon the sidesof the rod. It has a square opening at the centre,through…
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