In December 1958, while in Kenya, Cavendish became ill with polio.
In 1962, Cavendish and his friend Teddy Hall, the Oxford University professor, developed a wheelchair with a built-in respirator that freed Cavendish from confinement to his bed, which became the model for future devices of its type,[REF] with Cavendish eventually using a total of 10 different chairs [REF].