Shadow cross tube, a form of electron tube, invented by the physicist Sir William Crookes in 1879 and therefore also called Crookes tube. It is used for the study of cathode rays, here with a phosphorescent diamond, 1880, Historic, digitally restored reproduction of a 19th century original, exact original date not known.
Shadow cross tube, a form of electron tube, invented by the physicist Sir William Crookes in 1879 and therefore also called Crookes tube. It is used for the study of cathode rays, here with a phosphorescent diamond, 1880, Historic, digitally restored reproduction of a 19th century original, exact original date not known