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Dr. Hermon Schlundt sampling a pool in Norris Geyser Basin for radium in the early 1900s

By Yellowstone Volcano Observatory 1908 (approx.)
Dr. Hermon Schlundt sampling a pool in Norris Geyser Basin for radium in the early 1900s
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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.