William Dittmar (1859-1951), German chemist. In 1884 Dittmar calculated the average salinity of sea water from samples collected during the HMS Challe

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William Dittmar (1859-1951), German chemist. In 1884 Dittmar calculated the average salinity of sea water from samples collected during the HMS Challenger expedition of 1872-1876.

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Photo credit: © NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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