Question

discovery of electron?​

Answer 1

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

Answer 2

Here is your answer,

In mid 1850s many scientist mainly forady vegan to study electrical discharge in partially evacuated tubes known as cathode ray discharge tube. A Cathode Ray tube is made of glass containing two thin pieces of metal called electrols,sealed in it.

hope it will helps you.