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The Hillsboro wireless tower was a wireless telegraph station south of Hillsboro, Oregon, United States. Located adjacent to what is now Meriwether National Golf Club, at the time it was the second tallest steel tower in the world after France’s Eiffel Tower. The tower was constructed in 1921 and was torn down in 1952.〔Kimberli Fitzgerald, Deborah Raber, Hillsboro Historic Landmarks Advisory Committee, ''Hillsboro'' (Arcadia Publishing, 2009), ISBN 978-0738571829, p. 110. (Excerpts available ) at Google Books.〕 ==History== Federal Telegraph Company purchased property south of Hillsboro on September 20, 1920, from the Fred Rood estate, with completion of the project coming in 1921.〔Horner, John B. (1921). ''Oregon: Her History, Her Great Men, Her Literature''. The J.K. Gill Co.: Portland.〕 Federal paid $41,500 for the site that was then three miles from Hillsboro. The tower was built to replace a tower the federal government owned in Lents that the government removed and sent to Siberia during World War I. The dedication of telegraph station KGH came on May 11, 1921, with a crowd of 500 and the Hillsboro mayor, A. C. Shute, in attendance.〔World’s second-largest tower relayed wireless messages. ''Hillsboro Argus'', October 19, 1976.〕 Built on the station had one large tower at a height of surrounded by eight shorter towers arranged in a circle around the main tower in the center.〔 Once complete, it was the tallest structure on the Pacific Coast, and the only taller structures in the world were the Eiffel Tower in France and the Woolworth Building in New York City. Workers dug out deep concrete bases to secure the towers under the guidance of the engineer J. L. Miller.〔 Constructed of steel, the station cost $300,000 to build.〔 KGH used synchronous rotary spark gap transmitters. A 3 kW set for close ships and a 5 kW transmitter for ships far out at sea. A receiving set was installed on top of "The Board of Trade" building in Portland, Oregon. Transmission lines were placed between the Hillsboro transmitter site and Federal's Portland offices. In September 1927, KGH was purchased by Mackay Radio & Telegraph Company, a subsidiary of International Telephone & Telegraph Corporation.〔 Mackay Radio shortly thereafter installed a shortwave transmitter and replaced one of the spark gap transmitters with the new arc and tube type. On December 31, 1928, Mackay Radio announced a new more powerful transmitter would be installed by February 1929, making KGH the most powerful Marine Radio station in the Northwest. In April of that year the new transmitter was put into use by Mackay. In October 1935, a strike by employees of Mackay caused the transmitter to go dead. During World War II the United States government took over the operations of the station. It was then operated by the United States Coast Guard.〔 In 1951, the station was abandoned and subsequently torn down in 1952.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hillsboro wireless tower」の詳細全文を読む スポンサード リンク
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