Which scientist discovered the anode rays?

E. Goldstein in 1886 discovered anode rays (stream of positively charged particles) in a gas discharge experiment.

Explanation

A German scientist, Eugen Goldstein transformed the discharge tube and passed an electric current through it.
He discovered that positively charged rays were emitted from the anode in the discharge tube.  The experiment conducted by him is commonly referred to as the canal ray experiment. These rays were called canal rays. Goldstein conducted his own discharge tube experiments and named Kathodenstrahlen, or cathode rays, the light emissions examined by others.

Anode rays and canal rays are the same

These rays are particle beams that travel in a direction opposite to the “cathode rays,” which are electron waves that move through the anode. These positive rays were called Kanal strahlen by Goldstein, “channel rays” or “canal rays,” because the holes or channels in the cathode formed them.

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