My father, Bert Wraith, who has died aged 93, was a metallurgist and expert in the dispersion of gases in metals, a key process in refinement. He developed a method for studying bubbles injected into water that led to the design of useful processes for metals, including the idea of a cyclone to clean liquid metals.
In 2018 he was part of a group awarded a Royal Society prize. This was for work done at Swansea University on a laser-based system enabling the continuous monitoring of molten metal during the steelmaking process without the need to shut the furnace down.
