Friedrich von Hefner-Alteneck, Date of Birth, Place of Birth, Date of Death
TweetFriedrich von Hefner-Alteneck
German engineer
Date of Birth: 
Place of Birth: Aschaffenburg, Bavaria, Germany
About Friedrich von Hefner-Alteneck
- Friedrich Heinrich Philipp Franz von Hefner-Alteneck (April 27, 1845 in Aschaffenburg – January 6, 1904 in Biesdorf near Berlin) was a German electrical engineer and one of the closest aides of Werner von Siemens.
- He is largely remembered for the invention of the Hefner lamp, which provided the measure of luminous intensity used in Germany, Austria and Scandinavia from 1890 to 1942.
- The measure was called the Hefnerkerze (HK).
- The Hefnerkerze was superseded in the 1940s by the modern SI unit, the candela.He was elected a member of the Royal Swedish Academy of Sciences in 1896.
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