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Wednesday, September 24, 2014
"Fourth Order Fresnel Lens" The Maine Windjammer Project
"Fourth Order Fresnel Lens" by Doug MIlls
Fourth order Fresnel lens (1856) still in use in the Owls Head Lighthouse. [09-29-2013]
www.mainewindjammerproject.com
www.shootmainestudios.com
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