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Michigan Island Light
The Michigan Island Lighthouse is a lighthouse operated by the National Park Service and located on Michigan Island on western Lake Superior in the Apostle Islands National Lakeshore.
==History==
Two historical lighthouses have served as the Michigan Island light. The older was constructed in 1857, but not activated until 1869. It served until 1929 when it was replaced by a taller, skeletal tower, which is still operational.
The 3½-order Fresnel lens, coupled with a 24,000 candela electric light and the focal plane (aided by its placement on a cliff) aided by the tower's location atop the cliff, made the light range of visibility to a "remarkable 22 miles."〔(Terry Pepper, Seeing the Light, Michigan Island Light (New). )〕 This was a relative rarity, being one of only a dozen used around the country, most of which were on the Great Lakes,〔( Terry Pepper, Seeing the Light ''3½-order Fresnel lens''. )〕 These lights were typically reserved for places that were an especially serious hazard to navigation. ''See, for example,'' Sturgeon Point Light. Other Great Lakes lights that had 3½-order Fresnel lenses were at (in alphabetical order): DeTour Reef, Eagle Bluff, Grays Reef, Huron Island, St. Helena Island, and Toledo Harbor.〔
In 1972, the original Fresnel lens was replaced with a DCB-224 aero beacon〔(Aero beacon, Terry Pepper, Seeing the Light. )〕 manufactured by the Carlisle & Finch Company.〔(Carlisle & Finch Company. )〕 In turn, that was replaced by the Tideland Signal ML-300 acrylic optic.〔(Tideland Signal 300 mm Acrylic Optic, Terry Pepper, Seeing the Light. )〕 The restored Fresnel lens is on display at the visitor center of the Apostle Islands National Lakeshore in Bayfield.〔
The structure shares its design with towers at Rawley Point Light on Lake Michigan and Whitefish Point Light at Lake Superior's eastern end. However, the Michigan Island tower has a small brick building is located at the base of the center tube, apparently a workroom for the early lighthouse keepers.〔(Wobser, David, Michigan Island Lights, ''Great Laker Magazine'', boatnerd.com. )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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