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}} Hillsboro Inlet Light is located on the north side of Hillsboro Inlet, midway between Fort Lauderdale and Boca Raton, in Hillsboro Beach, Florida. The light marks the northern limit of the Florida Reef, an underwater coral formation on the lower east coast of the state. In 1901, the United States Lighthouse Establishment persuaded Congress to authorize the construction of a lighthouse in the dark area between Jupiter Inlet Light and Fowey Rocks Light. In the second half of the 20th century, this inlet became an increasingly busy waterway. Hillsboro Inlet Light is considered one of the most powerful lights in the world with a beam that can be seen for . The octagonal iron pyramidal tower was built at Russel Wheel & Foundry Co in Detroit, Michigan, moved to the Hillsboro Inlet Light Station in 1906, and lit on March 7, 1907. Its second-order bivalve Fresnel lens emits a light measuring 5.5 megacandelas and is placed above sea level. Automated in 1974, the light acts both as a coastal navigational aide and as a support to local water traffic. The light was relit in 2000, with of mercury replaced by a specially designed ball-bearing assembly. In 2003, Hillsboro Inlet Light was honored with a 37¢ U.S. postage stamp. == Notes == 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 Inlet Light」の詳細全文を読む スポンサード リンク
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