Fluorescence caused by cathode rays in a ga
© Science Museum / Science & Society Picture Library
Fluorescence caused by cathode rays in a gas discharge tube, 1879. Sir William Crookes' illustration of fluorescence in a gas discharge tube as published in Philosophical Transactions, 1879. Sir William Crookes (1832-1919) went on to demonstrate further properties of cathode rays in his famous 'Maltese Cross' experiment of 1887.