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J. J. Thomson’s deflection measurements showed that cathode rays consist of negatively charged particles with a common charge-to-mass ratio, establishing the electron as a constituent of matter.
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Deflection of cathode rays established a universal negatively charged subatomic particle.
The source theory, law, entity, prediction, or structural claim is directly tested, supported, constrained, or established by the target experiment or observation. Experimental support is not final logical proof; the edge detail states exactly what was measured.
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