Field-book for railroad engineers. [electronic resource] Containing formulOE for laying out curves, determining frog angles, levelling, calculating earth-work, etc. etc., together with tables of radii, ordinates, deflections ... tangents. Etc., etc. By John B. Henck ...
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.