Thanks to George McCourt for contributing this photo of the Fresnel lens collection of the Wisconsin Maritime Museum in Manitowoc. From left to right, we see:
Image copyright 2004 George McCourt; all rights reserved. Used by permission.
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Posted March 23, 2004. Checked and revised October 13, 2017. Site copyright 2017 Russ Rowlett and the University of North Carolina at Chapel Hill.