Dedication!
Bentley stood in the winter cold for hours at a time; waiting patiently until he caught falling flakes. Once a snowflake landed, he carefully handled it with a feather to place it under the lens. The apparatus was set up outside so that the delicate specimens would not melt, and after a minute and a half exposure, he captured the image of a snowflake.
https://siarchives.si.edu/history/featured-topics/stories/wilson-bentley-pioneering-photographer-snowflakes
From gathering this large collection of snowflakes, Bentley learned that every single snowflake was unique and in the year of his death he, along with William J. Humphreys, a physicist with the US Weather Bureau, published these findings in Snow Crystals, a volume containing 2300 of his photographs for all to study and enjoy.
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