Description: (British Chemist and Physicist Known for His Discovery of the Element 'Thallium' and Invention of 'Crookes Tubes')
William Crookes was a British chemist and physicist remembered as a pioneer of vacuum tubes. He was the inventor of what became known as the Crookes tube. He is also credited with the discovery of the element thallium. He was the first person to describe the spectrum of terrestrial helium. He was interested in spiritualism and occultism as well.