|Block Island Southeast Lighthouse's 1873 First Order Fresnel lens|
| 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.