I missed David Jones' work when he was alive. Does anyone know of online resources about his inventions and writing? His books are out of print and hard to get hold off.
Alternatively you could read through his columns in back issues of New Scientist and Nature at your local library but won't get the additional commentary and goofy drawings.
Finally, there's a documentary on his perpetual motion machines (possibly mentioned, haven't rtfa yet) which is more about the man than the machines. I had to write to its creator to get a copy though!