29
/
en
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
April 1, 2024
1408248
109923
2
Create
Public Timelines
Library
FAQ
For education
Cabinet
For educational institutions
For teachers
For students/pupils
jan 1, 1897 -
Description:
Modified cathode ray tubes were used to discover the positively charged proton.
Added to timeline:
2 Aug 2018
0
0
368
Development of atomic theory
Date:
jan 1, 1897
Now
~ 127 years ago