The Siemens differential arc lamp built in 1878 by Friedrich von Hefner-Alteneck


Old historic illustration: The Siemens differential arc lamp built in 1878 by Friedrich von Hefner-Alteneck (1845-1904, German electrical engineer, chief designer at Siemens & Halske), was published on Magasin Pittoresque, Paris, 1882


Size: 1999px × 4227px
Photo credit: © Old Images / Alamy / Afripics
License: Royalty Free
Model Released: No

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