Inside Out Library · Explore
Scientific American, Vol. 97, No. 14 (1907) (1907)
leaf 11
which serves as rod may be subdivided, as indicated in the illustration. a guide for bringing ties forwardly in laying them. of the side bars, the ladder does not readily sink into A patent on this improved leveling rod has been se- The tie channel extends to a great distance ahead of soft and… … IMPROVED LEVELING ROD. © 1907 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
More pictures from Scientific American, Vol. 97, No. 14 (1907)
More like this
