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Port Austin Light
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Port Austin Lighthouse (or Port Austin Reef Light) is a lighthouse off the shore of Lake Huron, about north of Port Austin, Huron County Michigan sitting on a rocky reef (shoal), which is just north of the tip of the Thumb and a real hazard to navigation.
==History==
The original plans were for this lighthouse to be built on shore. The crib was built in Tawas.〔(Lighthouse Central, Port Austin Lighthouse Photographs, History and Directions, ''The Ultimate Guide to East Michigan Lighthouses'' by Jerry Roach ) (Publisher: Bugs Publishing LLC - July 2006). ISBN 0-9747977-1-5; ISBN 978-0-9747977-1-7.〕
The light was first lit in 1878, and its pier was modified in 1899. It is still operational and is automated. The foundation materials are a pier, and the tower is constructed of yellow brick, with buff markings. It is an octagonal, tall tower, with an attached keeper house. However, the focal plain is . It originally had a fourth-order Fresnel lens by Henry Lepaute of Paris and installed in 1899. The optic was glass. In 1985 the lens was replaced by a 12-volt solar-powered Tideland Signal 300 mm acrylic optic,〔(Tideland 300 mm optic, Terry Pepper, Seeing the Light. )〕 which eliminated the need to maintain the submarine cable.〔〔(Lighthouse depot on Port Austin Light. )〕
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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