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Record #:
4109
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Abstract:
The eight coastal lighthouses are among the state's best-known symbols. However, they are not the state's only lights. Beacon lights were used at Ocracoke Inlet as early as 1715, and through the years, almost 30 other lighthouses and light ships have guided mariners. Most have been lost to warfare, neglect, and weather, so that only eight remain at the end of the 20th-century.
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Record #:
4111
Abstract:
Until the 1820s, flames reflecting off a mirrored surface fired lighthouse beacons around the world. Around 1815, French civil engineer Augustin Fresnel designed a system to use prisms to refract light and focus a powerful beam. The United States resisted using the new system for years, until it proved to be cost- effective. The first of four Fresnel lenses was installed at Cape Hatteras in 1854. Fresnel lenses were used at Hatteras until 1935, when the lighthouse closed.
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