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File:Sumner - circle of equal altitude.jpg

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English: Discovery of the circle of equal altitude - A New and Accurate Method of Finding a Ship's Position at Sea, by Projection on Mercator's Chart, Capt. Thomas H. Sumner, July 1843, Thomas Groom & Company of Boston
Date
Source A New and Accurate Method of Finding a Ship's Position at Sea, by Projection on Mercator's Chart, Capt. Thomas H. Sumner, July 1843, Thomas Groom & Company of Boston
Author Capt. Thomas H. Sumner

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Date/TimeThumbnailDimensionsUserComment
current14:04, 2 July 2015Thumbnail for version as of 14:04, 2 July 2015705 × 768 (90 KB)AndresruizgonzalezUser created page with UploadWizard

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