1900s radium ore revigorator intended to add radioactivity (radon) to drinking water.
https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
More:
https://www.orau.org/health-physics-...1924-1926.html
Previously:
https://www.homemadetools.net/forum/...718#post209758
https://www.homemadetools.net/forum/...059#post203180
https://www.homemadetools.net/forum/...538#post170195
https://www.homemadetools.net/forum/...923#post171576
https://www.homemadetools.net/forum/...491#post215620