Friedrich Heinrich Philipp Franz von Hefner-Alteneck (April 27, 1845 in Aschaffenburg – January 6, 1904 in Biesdorf near Berlin) was a German electrical...
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extracting gold from its ores (22 March 1898) Friedrich von Hefner-Alteneck—one of Siemens's aides Werner von Siemens Ring Award German inventors and discoverers...
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The Hefner lamp, or in German Hefnerkerze, is a flame lamp used in photometry that burns amyl acetate. The lamp was invented by Friedrich von Hefner-Alteneck...
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then an improved differential arc lamp had been developed by Friedrich von Hefner-Alteneck of Siemens & Halske. The United States was quick in adopting...
69 KB (7,837 words) - 16:47, 28 August 2024
Joseph von Lindwurm (1824–1874), physician and dermatologist Lujo Brentano (1844–1931), economist and social reformer Friedrich von Hefner-Alteneck (1845–1904)...
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generator and the other as motor. The drum rotor was introduced by Friedrich von Hefner-Alteneck of Siemens & Halske to replace Pacinotti's ring armature in...
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(AEG) in Berlin commissioned Friedrich von Hefner-Alteneck, an electrical engineer, to develop such a device. Hefner-Alteneck then designed the Mignon, an...
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(1864–1941), ⚭ 1884 married Arnold von Siemens (1853–1918), and Friedrich Julius von Helmholtz (1868–1901). In December 1899, Anna died while on vacation...
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1821) January 7 Parke Godwin, American journalist (born 1816) Friedrich von Hefner-Alteneck, German engineer (born 1845) Emmanuel Rhoides, Greek writer...
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leader 4 January – Friedrich Jolly, neurologist 5 January – Karl Alfred von Zittel, palaeontologist 6 January – Friedrich von Hefner-Alteneck, electrical engineer...
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