![](THAMES_BARRIER.med.jpg)
The Thames Barrier spans the River Thames to protect London from storm surge that might otherwise cause flooding in the city center. The Barrier is the second largest such flood control system in the world. It's construction was completed in 1984 and its gates have been raised more than 100 times since then in duty to the city.
These fixtures were found in the Thames Barrier Information and Learning Center (and Cafe).