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The Telectroscope lets Londoners and New Yorkers see each other in real time.
In all its optical brilliance and brass and wood, there stood the Telectroscope: an 11.2-meter-(37 feet) long by 3.3-meter-(11 feet) tall dream of a device allowing people on one side of the Atlantic to look into its person-size lens and, in real time, see those on the other side via a recently completed tunnel running under the ocean. (Think 19th-century Webcam. Or maybe Victorian-age video phone.)