Late this summer, I made this image of the Chicago Harbor Lighthouse. Located in Lake Michigan, the handsome old nautical aid sits where the Chicago river meets the big lake.
The lighthouse was constructed in 1893 for the World’s Columbian Exposition and was moved to its present site in 1919.
It had an amazing Fresnel lens that was removed from the lighthouse for some reason. It was eventually put on display at the Cabrillo National Monument near San Diego, CA.
It looked like the beautiful third-order Fresnel lens pictured here.
A third order Fresnel lens is a type of compact lens originally developed by Frenchphysicist Augustin-Jean Fresnel specifically for lighthouses.