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Point Cabrillo Light
Point Cabrillo Light is a lighthouse in northern California, United States, between Point Arena and Cape Mendocino, just south of the community of Caspar. It has been a federal aid to navigation since 1909. It is part of the California state park system as Point Cabrillo Light Station State Historic Park.〔
It should not be confused with the inactive Old Point Loma Lighthouse or the active New Point Loma Lighthouse in San Diego, both of which lie within the grounds of Cabrillo National Monument and are sometimes referred to as the Cabrillo lighthouse.
==Description==
The Point Cabrillo Lighthouse complex is located about north of Mendocino, California, and includes the lighthouse itself together with several outbuildings. Most of the original structures remain, but the barn is missing: in 1986 it was destroyed in a fire department exercise.〔 The remaining lighthouse station is "one of the most complete light stations in the United States".〔.〕
Atop the lighthouse spins a third-order Fresnel lens with four panels containing 90 lead glass prisms and weighing 6800 pounds, constructed by Chance Brothers, an English company, and shipped to Point Cabrillo around Cape Horn. The light is only above the ground, but because of the height of the headlands it stands above sea level. It was originally lit by a kerosene lamp and turned by a clockwork mechanism but this was replaced by an electric light and motor in 1935. The present light uses a single 1000-watt electric filament. Depending on atmospheric conditions, the Fresnel lens creates a focused beam which can be seen to the horizon and beyond. The beam rotates once every 40 seconds, producing a flash every 10 seconds.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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