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Sentinels of the Rocks
Dennis L. NobleT. Michael O'Brien
其他書名
From "Graveyard Coast" to National Lakeshore
出版Northern Michigan University Press, 1979
主題History / United States / State & Local / Midwest (IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI)Travel / Museums, Tours, Points of Interest
ISBN09186160349780918616036
URLhttp://books.google.com.hk/books?id=sJThAAAAMAAJ&hl=&source=gbs_api
註釋"Sentinels of the Rocks: From Graveyard Coast to National Lakeshore" is the story of a light station - the Au Sable Light on Lake Superior. The book touches on the Lighthouse Service and the Life Saving Service, predecessors of today's Coast Guard. It sketched the Fresnel lens, an important lifesaver, and many other lifesaving devices.