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Up for sale a RARE! "Historic Scientists" Multi Signed Announcement. Signers are; Lars Gunnar Sillen (Chemistry), John S Hall (Astronomy) and Chang-Yung Fan (Physics).
ES-4869E
Bo
Lars Gunnar Sillén,
born July 11, 1916 in Stockholm, died July 23, 1970, was a Swedish chemist. Sillén
defended her dissertation in 1940 in analytical chemistry at Stockholm
University, and from 1950 was professor of inorganic chemistry at the Royal Institute
of Technology. In his early career, he mostly worked with X-ray diffraction as
a method of determining mineral phases, especially in the case of bismuth
compounds. He then became an internationally known solution chemist. Several of
his publications are considered standard works in geochemistry, and his work
influenced other well-known geochemists such as Robert Garrels and Werner
Stumm. Sillén was a pioneer, especially when it came to understanding the
chemical composition of oceans. Previously, it was thought that the chemistry
of seawater was determined by weathering from various minerals. Sillén was able
to show that precipitation reactions were also significant, and his hypothesis
was that the composition of seawater could be calculated from nine different
equilibrium reactions. Furthermore, Sillén was very active in the compilation
of thermodynamic data for equilibrium reactions, and in the 1960s was a pioneer
in using computer calculations to process equilibrium data from various
measurement sources. He also published textbooks. He also occasionally worked
for FOA. Sillén was elected in 1964 as a member of both the Academy of Sciences
and the Academy of Engineering Sciences.
