1. Lighthouses By Peter D Aberdeen High School, 1999

2. Lighthouse History First lighthouses -found around Mediterranean Sea -consisted of fires on top of coastal hills First traditional lighthouse structure -Pharos light of Alexandria constructed around 280 B.C. 280 feet tall -reflectors contained wood fire -could be seen for 35 miles

3. Lighthouse History- 2 Ancient Lighthouses -Portus, Italy 46 A.D. -Boulongne, France -Dover, England -Genoa, Italy 1139 -Leghorn 1304 First in U.S. -Boston Light near Boston Harbor, 1716

4. Lighthouse History - 3 U.S. lights maintained and upkept by U.S. Coast Guard since July 1, 1939. Worldwide, more than 30,000 lights today First lightship stationed in Thames estuary in 1732

5. Fresnel Lens First constructed in 1822 by French physicist A. Fresnel Uses concentric rings of glass prisms to bend and focus light into a narrow beam Often as tall as twelve feet

6. Concord Point Lighthouse

7. Concord Point Light - 2 Built in 1827 at the mouth of the Susquehanna River in Havre De Grace 36 foot tower, originally built with tin reflector, upgraded to fresnel lens in 1854 Decommissioned in 1975 Link to information on Concord Point Lighthouse and other lighthouses