Ron Cook started work in the Cambridge Physiological Laboratory in 1948 as a Craftsman. He went on to work as Alan Hodgkin’s Instrument Maker, then Technical Officer until his retirement in 1987. With his interest in aquaria, he was able immediately to introduce cuttlefish (Sepia) to Cambridge. They were used by Hodgkin and Richard Keynes for the ion flux measurements that backed up the then new ionic theory of the action potential.

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