Primarily, the exterior or fascia steel girders were rehabilitated along with the bascule tower piers. Tower Bridge opened in 1894 as a bascule bridge. The fixed-trunnion (sometimes a "Chicago" bascule) rotates around a large axle that raises the span(s). Poole Bridge, a narrow bascule bridge constructed in 1927, connects the town centre and Hamworthy. The Erasmus Bridge has an orthotropic deck for both its cable-stayed bridge and bascule span. The original bridge was a low-level bascule bridge constructed in 1924. Certain types of bascule bridges roll on an arc; an example is the Pegasus Bridge. Birkenhead Bridge, the first bascule bridge in Australia, opened in 1940. This was a bascule bridge designed by Sir Horace Jones, completed in 1895. The main pier which supports the bascule span is Pier 4. The bascule pivots and operating machinery are housed in the base of each tower. The city was once home to several smaller bascule bridges. The inspection uncovered corrosion to the bascule span. The bascule system was designed by Joseph Strauss. The rider is not trying to encourage a great bascule from the horse.