Great - I found this site:
http://www.frenchriverland.com/index.html When browsing the other week - it has downloadable images of all sorts of turbines and pelton wheels, including manufacturers catalogs - Gilbert Gilkes being represented by at least two! Fascinating if you are into water power technology. Some pages are a bit slow to download because of the all the images, but well worth the wait.
Cheers
Graham
The map is the territory - especially in chain scale.