This cathode ray also became known as an ‘electron gun’. Physicists in the 19th century found out that if they constructed a glass tube with wires inserted in both ends, and pumped out as much of the air as they could, an electric charge passed across the tube from the wires would create a fluorescent glow. Look at any glowing neon sign or any ‘old-fashioned’ television set, and you are looking at the modern descendants of the cathode ray tube. In 1932, Chadwik discovered neutron by bombarding a thin sheet of beryllium by α-particles.Even without consciously realizing it, most of us are already aware of what a cathode ray tube is.
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