We recently visited the Westport Maritime Museum here in Washington and they have on display Destruction Island's first-order Fresnel lens. This lens has 1,176 prisms and 24 bullseyes. It was manufactured in 1888 and illuminated for the first time in 1891. It was removed from Destruction Island for security reasons in 1995. The Westport Maritime Museum launched a 3 year volunteer effort to raise funds and put up a new museum-quality building to house the lens. It is awesome to see. I have some pictures I would be happy to post if someone could tell me how to do it. Thanks. Darlene