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The Principles of Mr. Harrison's Time-keeper
John HarrisonGreat Britain. Commissioners of Longitude
其他書名
With Plates of the Same
出版W. Richardson and S. Clark and sold by J. Nourse, 1768
URLhttp://books.google.com.hk/books?id=MwZZAAAAcAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋Description of Harrison's chronometer which provided the technical means of solving the centuries old navigational problem of establishing longitude at sea.