What is hidden in 3D image?

Stereogram - 3D Image

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Radiotelephone

In 1915, the first experimental transatlantic radiotelephone speech communication was made. Taking advantage of the recently developed vacuum-tube transmitters and receivers, AT&T conducted radiotelephony tests from NAA, the U.S. Navy station in Arlington. B. Webb of AT&T in Arlington, VA.Virginia talks to Lt. Col. Ferries of the French Government using relay points in Canada and at the Eiffel Tower in Paris.His voice was heard as far away as Honolulu, HI., which clearly showed how advanced the vacuum-tube equipment was, since the "somewhat over 10 miles" (16-km) range of Fessenden's groundbreaking alternator-transmitter tests (1906). President Vail announced that AT&T was planning to add radiotelephone links to the Bell system.

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