At this site you will find a picture of a focault pendulum clock that
has a cone shaped piece of metal from a hydroelectric generating
station. nThe metal is 'said' to be really hard, but it has been
abraded/contorted into a very interesting shape. The question
is....what part is it, what was it's function? It is interesting to
note that the very tip shows little deformation/abrasion; could it be
the 'end' instead of the 'point' of an apparatus in the flow of water?
rick

http://www.betrisey.ch/epointe.html