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lens lantern : ウィキペディア英語版 | lens lantern A lens lantern is a small, self-contained lamp structure which may sometimes be used to serve as a lighthouse. Unlike a regular Fresnel lens, the lantern requires no housing to protect it from the weather; its glass sides would refract and magnify the light in the same fashion as would the lens. Lens lanterns were popular alternatives to lighthouses in the nineteenth century; they required less care, were cheaper to erect, and could be fairly easily placed.〔http://www.tripadvisor.com.au/LocationPhotoDirectLink-g32701-d214092-i99816159-Point_Cabrillo_Light_Station_State_Historic_Park-Mendocino_Mendocino_County.html#99816159〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「lens lantern」の詳細全文を読む
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