Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States (1883)
Vose, George L. (George Leonard), 1831-1910 · Boston : Lee and Shepard · leaf 45
Fig. 7- Fig. 8. the small separated circles. If the cones are of different sizes,as in Fig. io, the circles on the plan are also of different sizes.
Railroad engineering
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
