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IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. In the early nineteenth century, ...

In the 1820s, Augustin Fresnel invented a new kind of lens and installed it in France’s Cordouan lighthouse. Suddenly, one lamp could light the way for sailors many miles out to sea. “Were I a Roman ...

KEWAUNEE COUNTY - The two fifth-order Fresnel lenses in the county's two lighthouses were removed June 5 under the order of the U.S. Coast Guard, but the old and valuable lenses won't be in hiding ...