Archimedes' screw screws of decreasing pitch are used for the compaction of waste material. If water is fed into the top of an Archimedes screw, it will force the screw to rotate. The rotating shaft can then be used to drive an electric generator. Such an installation has the same benefits as using the screw for pumping: the ability to handle very dirty water and widely varying rates of flow at high efficiency. Settle Hydro and Torrs Hydro are two reverse screw micro hydro schemes operating in England. The screw works well as a generator at low heads, commonly found in English
Archimedes-lab.org and the development of creativity. Here's a quote from Scientific American (May 27, 2003): "This virtual lab borrows the empirical spirit and creative curiosity that Archimedes brought to his work and invites visitors to explore with the same expectations for mind-blowing discovery." Archimedes-lab.org has won several awards from scientific and educational publications, including a Scientific American Web Award in 2003, the National Council of Teachers of Mathematics Web Award, and a mention in MERLOT, the Multimedia Educational Resource for Learning and Online Teaching and in The DO-IT Center, the Disabilities, Opportunities, Internetworking, and Technology Center. Archimedes-lab.org Archimedes-lab.org is a free