Notably this wasn't the first water computer. Compare
1) Water Integrator, Vladimir Lukyanov, Soviet Union 1936
2) The MONIAC (Monetary National Income Analogue Computer) or Phillips Hydraulic Computer (also known as the Phillips Machine), William Phillips, GB 1949
[1] http://translate.google.com/translate?sl=ru&tl=en&js=n&prev=...
[2] http://www.theguardian.com/business/2008/may/08/bankofenglan...
https://www.youtube.com/watch?v=k_-uGHWz_k0 (Video, 2009)