Analysis of information sources in references of the Wikipedia article "Euro gold and silver commemorative coins (Austria)" in English language version.
The technology developed by Austrian lighting pioneer Carl Auer von Welsbach is still in use in billions of light bulbs around the world today. The stunning 2008 edition 25 euro silver niobium coin celebrates the 150th anniversary of his birth.... Born in Vienna in 1858, chemist and entrepreneur Carl Auer von Welsbach was one of the key figures in the development of the gas lamp. The obverse of this coin therefore shows...such a lamp being lit outside Vienna's neo-gothic city hall.... The reverse depicts the sun, the ultimate source of light, a portrait of Carl Auer von Welsbach and, in the Sterling silver outer ring, the evolution of lighting technology