Hydraulic RAM

Hydraulic ram

http://en.wikipedia.org/wiki/Hydraulic_ram

http://www.instructables.com/id/Hydraulic-Ram-Pump/

http://www.motherearthnews.com/diy/hydraulic-ram-pump-zmaz79mjzraw.aspx#axzz3FvjmIXQP

http://www.youtube.com/watch?v=Ct1QQ7KvjN8

http://www.riferam.com/