Tower Bridge Steam Engine 20 x 10 Wrap with Free Shipping with in the United States
Tower Bridge Steam Engine
The original raising mechanism was powered by pressurized water stored in several hydraulic accumulators. The system was designed and installed by Hamilton Owen Rendel while working for Armstrong, Mitchell and Company of Newcastle upon Tyne. Water at a pressure of 750 psi (5.2 MPa), was pumped into the accumulators by a pair of stationary steam engines. Each drove a force pump from its piston tail rod. The accumulators each comprise a 20-inch (51 cm) ram on which sits a very heavy weight to maintain the desired pressure.
To learn more https://en.wikipedia.org/wiki/Tower_Bridge