This is a photograph that I took at the Eastern California Museum in Independence, California. It's actually a pipe that was used to transfer water out of the Owens Valley river to hydro-electric plants. The pipes were used until recent times and were only replaced when required. This one was used until 1997, before it was replaced with a concrete one. On the outside of the pipe is a very elaborate system of tensioning bolts that held the wooden planks together and could be adjusted for leaks.