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APPENDIX 285 1930 (February 18)—Drawing of rectangular design is sent by television to Australia and flashed back to Schenectady with out losing its identity. 1930 (March 11)—Arrival of Byrd Antarctic Expedition at Dune- din, New Zealand, and two-way conversation between mem bers of the expedition and friends in New York heard in a rebroadcast throughout the United States. 1930 (April 6)—John L. Baird televises "abbreviated vaudeville" in London. 1930 (April 9)—Two-way wire television in which speakers at ends of 3-mile line see each other as they converse is demon strated by Bell Telephone Laboratories. 1930 (April)—U. A. Sanabria shows television images on a two- foot screen in his Chicago laboratory. 1930 (April 30)—Two-way radiophone conversation between Marconi aboard his yacht near Italian coast and friends in New York. 1930— The pentode and supercontrol tubes for broadcast reception are introduced. 1930 (May 22)—Television is seen on six-foot screen in Proctor's theater in Schenectady. 1930 (June)—S.S. America off Fastnet Island, approximately 3,000 miles from New York, picks up facsimile messages from United States. 1930 (June)—Plans announced for $250,000,000 Radio City to be built on Manhattan Island. 1930 (June 10)—John Hays Hammond, Jr., describes his patent for a television eye for airplanes that enables pilots to "see" through fog and darkness to make safe landings. 1930 (June 30)—First round-the-world broadcast, Schenectady to Holland, relay to Java, Australia and back to point of origin in less than a second. 1930 (July 20)— Play, The Man with a Flower in his Mouth, tele vised in London while dramatic critics watch. 1930 (July 30)—Religious program in Nidaros Cathedral, Nor way, in celebration of 900th anniversary of introduction of Christianity in Norway rebroadcast in United States. 1930 (September 14)— Provisional President Uriburu of the Argentine Republic addresses American people by radio from Buenos Aires. 1930 (December 6)— Direct radio communication established with China by opening of circuit between San Francisco and Shanghai.