Tara Šiljak
 A classic and we all know him, Nikola Tesla.
 Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical
engineer, and futurist best known for his contributions to the design of the
modern alternating current (AC) electricity supply system.
 He immigrated to the United States in 1884 and sold the patent rights to his system
of alternating-current dynamos, transformers, and motors to George Westinghouse.
In 1891 he invented the Tesla coil, an induction coil widely used in radio
technology.
 Training for an engineering career, he attended the Technical University
at Graz, Austria (where my brother goes ), and the University of Prague. At Graz
he first saw the Gramme dynamo, which operated as a generator and, when
reversed, became an electric motor, and he conceived a way to use alternating
current to advantage.
 Later, at Budapest, he visualized the principle of the rotating magnetic field and
developed plans for an induction motor that would become his first step toward the
successful utilization of alternating current.
 In 1882 Tesla went to work in Paris for the Continental Edison Company, and, while
on assignment to Strassburg in 1883, he constructed, after work hours, his first
induction motor. Tesla sailed for America in 1884, arriving in New York with four
cents in his pocket, a few of his own poems, and calculations for a flying machine.
He first found employment with Thomas Edison, but the two inventors were far
apart in background and methods, and their separation was inevitable.
 Franjo Hanaman was a Croatian inventor, engineer, and chemist, who gained
world recognition for inventing the world's first applied electric light-bulb with a
metal filament (tungsten) with his assistant Alexander Just, independently of his
contemporaries.
 They were granted the Hungarian Patent #34541 on December 13, 1904
in Budapest. His invention of tungsten filament was also applied in improving
early diodes and triodes.
 He was born to a Croatian family as a second child of father Gjuro Hanaman and
Emilija Mandušić.
 In April 1903, Dr. Just and Hanaman protected their first process for obtaining
tungsten filaments (substitution process) in Vienna with the patent of D. R. P. No.
154262. The patent is entitled Verfahren zur Herstellung von Glühlkörpern aus
Tungsten or Molybdän für elektrische Glühlampen. The filament lamps obtained
by this method consumed only about 1.5 W per Hefner candle, in contrast to the
carbon filament lamps, which consumed 3-4 W. The main disadvantage of the
tungsten filament lamps obtained by this method was the fragility of the filament.
 In 1922 he was elected full professor of inorganic chemical technology and
metallurgy, when he also founded the Department of Inorganic Chemical
Technology and Metallurgy at the then Chemical Engineering Department. In the
same year he became the dean of the Chemical Engineering Department of the
Technical College. After August 31, 1926, when the Technical School became the
Technical Faculty, he became vice dean. From 1939 until the end of his life he was
the head of the Department of Mining and Metallurgy of the Technical Faculty.
 chemist and Nobelist, one of the greatest scientists who came from our area.
 Vladimir Prelog was born in 1906 in Sarajevo.
 He attended elementary school in Sarajevo, and after his parents divorced in 1915,
he came to Croatia with his father. He finished school in Zagreb, where he started
attending high school, and in the third grade he moved to Osijek with his father.
There he continued his high school education at the Royal Real Gymnasium and
became interested in chemistry.
 Already at the age of fifteen, Prelog published his first scientific paper in chemistry,
Eine Titriervorrichtung, which was published in the German scientific journal
Chemiker-Zeitung in 1921.
 After graduating in Zagreb in 1924, he went to study chemistry in Prague, where he
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graduated from the Chemical Technology Department of the Technical College in 1928,
and received his doctorate in 1929 under the guidance of Emil Votoček.
After his doctorate, he worked for some time in the chemical wholesale laboratory of G. J.
Dřiza, and in 1934 he returned to Zagreb where from 1935 to 1941 he was an assistant
professor and taught organic chemistry at the Technical Faculty, but also the head of the
Department of Organic Chemistry.
In 1941, at the invitation of Lavoslav Ružička, he went to Switzerland due to the then political
situation.
He was a member of many academies of science and an honorary doctor of many
universities in Europe.
Prelog was the first with his doctoral student Rativoj Seiwerth to synthesize adamantane, a
hydrocarbon of a very stable polycyclic structure, isolated from Moravian oil.
In the seven years of its operation in Zagreb, Prelog's working group has published 48
scientific papers.
At the Federal Technical School (ETH) in Zurich he was a private assistant professor from
1942, associate professor from 1947, full professor of organic chemistry from 1950, and in
1957, after Lavoslav Ružička retired, he took over the presidency of the Laboratory for
organic chemistry
 Prelog introduces the name chemical topology for the field of stereochemistry that
deals with the geometric properties of molecules. He contributed to the
explanation of the structure of steroids, quinine, strychnine, and other alkaloids,
and synthesized many organic compounds. His work has contributed to an
understanding of the nature of enzymatic reactions.
 In 1975, Vladimir Prelog received the Nobel Prize in Chemistry for his work in the
field of organic natural compounds and stereochemistry.