Circles in the Sky: The Life and Times of George Ferris - Richard G. Weingardt - Google Books

http://books.google.de/books?id=uIFwg5LOnnoC&printsec=frontcover&dq=isbn:9780784410103&ie=ISO-8859-1&cd=1

In the summer of 1893, at the Columbian Exposition in Chicago, an engineering marvel was unveiled and immediately captured the world's attention. It was a towering, web-like giant wheel, standing upright and rotating high above the city. Several…