Bridges Author:Henry Billings In Bridges, Henry Billings, noted for his popular, lucid works on engineering, now presents a comprehensive, up-to-date account of those fascinating structure which span our rivers, chasms and roads, affording passage to moving Americans. A special feature of the book is the very original diagrammatic chapter explaining clearly and simply how b... more »ridges do their work. And over 50 clear, crisp pictures in black and white help the reader to experience those structures.« less