Bridges - Across the Gap

Barbara Armstrong, Stephen Shadwell, Jeff Fowler

The Wright Group

1995

36 páginas

1h 12m

ISBN-13: 9780780229440

In ancient times, a simple log place across a stream was a perfectly adequate bridge--but as technology developed, so too did the methods we used to cross rough terrain or water. Now, many bridges are marvels or engineering, and use many of the same principles discovered centuries ago.