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My favorite part of lighthouses is the Fresnel lens they used to use. This lighthouse in Mendocino, California on the Pacific Coast is very unusual in that it still has a Fresnel glass lens. Even more unusual is the Fresnel lens still rotates and works.

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This is a historical image above photographed at the Lighthouse.

Large video of Fresnel Lens turning:
Cabrillo Lighthouse in Mendocino, California: http://youtu.be/hG5t2sFXRrg

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