Diagram of he Siemens differential arc lamp built in 1878 by Friedrich von Hefner-Alteneck
Old historic illustration: Diagram of 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: 2734px × 3168px
Photo credit: © Old Images / Alamy / Afripics
License: Royalty Free
Model Released: No
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