Rooting around in the fascinating stuff at the bottom of a draw labelled 'Engineering - Junk Miscellaneous'. Delving amongst the delightful...
An Engineer in Wonderland – Thinking microfluidics
The remarkable thing about this hydraulic circuit is that it generates is own control signals, there are no external signal inputs – so it is less a collection of tubes and more a self-oscillating state-machine.
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I will keep it that way for as long as possible.