Block Island Southeast Lighthouse's 1873 First Order Fresnel lens |
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Courtesy of the Library of Congress and Historic American Engineering Record, National Rark Service, Patrici Del Real, 1988 Library of Congress, Prints & Photographs Division, HAER RI,5-NESH,1-(sheet 9 of 12) |
© 2004 R. Holmes. Do not reproduce any part of this website without permission of the author.