In mid-20th century America, a typical circus traveled from town to town by train, performing under a huge canvas tent commonly called a "big top". The Ringling Brothers and Barnum & Bailey Circus was no exception: what made it stand out was that it was the largest circus in the country. Its big top could seat 9,000 spectators around its three rings; the tent's canvas had been coated with of paraffin wax dissolved in of gasoline, a common waterproofing method of the time.