The Underground Railroad

The Underground RailroadIn the winter of 1852, a group of Philadelphia abolitionists dedicated to assisting runaway slaves in their flight to freedom formed a new assistance group to be part of the Underground Railroadthe General Vigilance Committee. William Still, himself a son of slaves, was named its secretary and executive director. Deeply moved by the stories of the fugitive slaves he helped conduct northward, Still took his committee record keeping to a higher level.

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Grouped according to geography and economics — two prime considerations facing bridge engineers — the spans are described in a highly readable text that explains the design principles of cantilever

GRAPHICAL REPRESENTATIONS: Euclidean and Complex Spaces

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