A new and accurate method of finding a ship's position at sea, by projection on Mercator's chart ... The principles of the method being fully explained and illustrated by problems, examples, and plates, with rules for practice, and examples from actual observation

Chicago citation style
Sumner, Thomas H. A new and accurate method of finding a ship's position at sea, by projection on Mercator's chart ... The principles of the method being fully explained and illustrated by problems, examples, and plates, with rules for practice, and examples from actual observation. 1851. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007940609. (Accessed December 11, 2018.)
APA citation style
Sumner, Thomas H, (1851) A new and accurate method of finding a ship's position at sea, by projection on Mercator's chart ... The principles of the method being fully explained and illustrated by problems, examples, and plates, with rules for practice, and examples from actual observation. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/007940609
MLA citation style
Sumner, Thomas H. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/007940609>.
Note: These citations are programmatically generated and may be incomplete.