Dr. Hermon Schlundt sampling a pool in Norris Geyser Basin for radium in the early 1900s
By Yellowstone Volcano Observatory
1908 (approx.)
Detailed Description
Photo of Dr. Hermon Schlundt and a park ranger sampling a pool in Norris Geyser Basin for radium. The description of the photo states that this was the site where the radioactive element thorium was first discovered in the United States. Plate IIIB from Schlundt and Moore, 1909 (USGS Bulletin 395).
Sources/Usage
Public Domain.