# Caisson lighthouse

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{{Short description|Lighthouse whose superstructure rests on a concrete or metal caisson}}
A '''caisson lighthouse''' (also referred to as a '''sparkplug lighthouse''', or '''bug light''') is a type of [lighthouse](/source/lighthouse) whose superstructure rests on a [concrete](/source/concrete) or metal [caisson](/source/caisson_(engineering)).<ref name="Rowlett">{{cite rowlett|sparkplugs|access-date=February 27, 2018}}</ref> Caisson lighthouses were developed in the late nineteenth century as a cheaper alternative to [screwpile lighthouse](/source/screwpile_lighthouse)s. The caisson design was also more efficient as it could better withstand harsh weather, and was not as fragile. Caisson lighthouses usually have living quarters made of [cast iron](/source/cast_iron), although some brick examples are known. The two American nicknames were later coined because of the structure's shape.<ref name="Rowlett"/><ref>Jeremy D'Entremont, "The Lighthouses of New England," Commonwealth Editions, 2003.</ref><ref>Tim Harrison i Ray Jones, "Lighthouses of the Mid-Atlantic Coast," Globe Pequot Press, 2002</ref>

==Gallery==
{{Gallery
|Image:USCGwolftraplight1960.jpg|{{center|[Wolf Trap Light](/source/Wolf_Trap_Light)<br>a caisson lighthouse in the [Chesapeake Bay](/source/Chesapeake_Bay)}}
|Image:Smith point light.PNG|{{center|[Smith Point Light](/source/Smith_Point_Light)<br>located at the mouth of the [Potomac River](/source/Potomac_River)}}
|File:Duxbury_Pier_light_house_in_Plymouth_harbor.jpg|{{center|[Duxbury Pier Light](/source/Duxbury_Pier_Light)<br> in [Plymouth Harbor](/source/Plymouth_Harbor), [Massachusetts](/source/Massachusetts), was the first of its kind in [New England](/source/New_England).}}
|File:Green's Ledge Light, Norwalk 1907.jpg|{{center|[Greens Ledge Light](/source/Greens_Ledge_Light)<br>stands in open water about {{convert|10|ft}} deep, about 1 km from land}}
|File:Sakonnet Lighthouse RI 2.jpg|{{center|[Sakonnet Light](/source/Sakonnet_Light)<br>is on a small rock}}
}}

==See also==
{{commons category-inline}}

==References==
{{reflist}}

{{Lighthouses}}

Category:Lighthouses
Category:Caissons

{{pharology-stub}}

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Adapted from the Wikipedia article [Caisson lighthouse](https://en.wikipedia.org/wiki/Caisson_lighthouse) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Caisson_lighthouse?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.