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In order to appreciate the wide range of achievements of William
Justin Kroll, it is interesting to chronologically list his
investigations, developments, research findings and discoveries. Like all
good researchers he used the knowledge gained through a previous
investigation to implement and support the current and future research
programs. This trend can be clearly seen in the following outline of Dr.

Kroll‘s achievements.

The Early Yì.èf$v From 1910 to 1917 DI. Kroll studied at the
Technischen Hochschule in Charlottenburg, Germany where he studied iron
metallurgy and worked as an assistant to Professor w. Mathesius. He
completed his doctoral thesis under the supervision of K. A. Hofman on the
production of pure boron. He states that, "this influenced my future life
deeply, for I never strayed far from the chosen field of preparatlve
chemistry".

In 1917 he was employed by Metallgesellschaft in Frankfurt/Main and
was sent to the lead refinery at Call/Eifel. There he developed a process
for producing calcium-barlum-lead bearing alloys by injecting sodium into
a bath of lead containing barium and Calcium chlorides. Figure l shows the
schematic representation of his sod1um injector from producing the
Calcium-lead alloy. He also worked on the development of a process to
debismuthize lead and techniques to remove antimony and arsenic from tin

alloys using aluminum.