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Jane Morgan's handwritten note on back reads, "Artist's rendering of the first Poulsen arc, brought from Denmark in 1909 by Cyril Elwell." Drawing of the Poulsen 5 kW arc transmitter. Copy made by Santa Clara County Photography Department.
Arc converter Electric arc (LCSH) Federal Telegraph Company--History (LCSH) Poulsen Arc Transmitter Poulsen Wireless Telephone and Telegraph Company Telegraph, Wireless (LCSH)