what did thomson discover with his cathode ray tube experiment?
Electron
contradiction
 Other experiments were conducted by Pieter Zeeman in 1914 – 1915 . Using a scaled @-@ up version of Michelson 's apparatus connected directly to Amsterdam 's main water conduit , Zeeman was able to perform extended measurements using monochromatic light ranging from violet ( 4358 Å ) through red ( 6870 Å ) to confirm Lorentz 's modified coefficient . In 1910 , Franz Harress used a rotating device and overall confirmed Fresnel 's dragging coefficient . However , he additionally found a " systematic bias " in the data , which later turned out to be the Sagnac effect . 

neutral
 That same year , J.J. Thomson conducted an experiment in which he channeled a stream of neon ions through magnetic and electric fields , striking a photographic plate at the other end . He observed two glowing patches on the plate , which suggested two different deflection trajectories . Thomson concluded this was because some of the neon ions had a different mass . The nature of this differing mass would later be explained by the discovery of neutrons in 1932 . 

neutral
 This phenomenon was first observed in a 1938 experiment performed by Herbert E. Ives and G.R. Stilwell , called the Ives – Stilwell experiment . 

contradiction
 Despite the dissatisfaction of most physicists with Fresnel 's partial aether @-@ dragging hypothesis , repetitions and improvements to his experiment ( see sections above ) by others confirmed his results to high accuracy . 

contradiction
 Shortly afterwards , the electromagnetic nature of light was demonstrated by the experiments of Heinrich Hertz in Germany . 
