Lighthouses By Peter D Aberdeen High School, 1999.

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Presentation transcript:

Lighthouses By Peter D Aberdeen High School, 1999

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

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

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

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

Concord Point Lighthouse

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