Ancient and modern engineering and the Isthmian canal (1903)
Burr, William H. (William Hubert), 1851-1934 · New York, J. Wiley & Sons; [etc., etc.] · leaf 353
Pennsylvania R. R., and a special type adopted by the B. & O. for the belt-line tunnel at Baltimore. These sections show all main dimensions and the provision made for drainage. The general depth of ballast is about 18 inches, including the drainage layer at the bottom. The total width of road-bed… … Fig. 4.— Baltimore Belt-line Tunnel, B. & O. Ry. are found to be admirably met. Timber ties are almost invaria- bly used at the present time in this country, although some experi- mental steel ties have been laid at various points. Fig. 5 shows
Civil engineering · Canals, Interoceanic
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
