The Gulf Stream is a warm and swift Atlantic Ocean current that originates in the Gulf of Mexico and crosses the Atlantic. It was discovered in 1512 by the Spanish explorer Ponce de León. In the 18th century, Benjamin Franklin became interested in North Atlantic Ocean circulation patterns based on observed variations in transatlantic navigation times of various ships. Franklin named the Gulf Stream and worked with ship captains to chart it. His Gulf Stream chart was published in 1770 in England, with a version published in the United States in 1786.
The above offered chart was published in Philadelphia for the American Philosophical Society in 1799. It is based in part on a chart published in the 1780s in London as part of an atlas of the West Indies. The American Philosophical Society (APS) was founded in Philadelphia in 1743. Its mission was to promote education and research in the sciences and humanities. It is still extant today.
Condition: Generally very good with the usual light overall toning and wear. Creases from folds, as issued, later professionally flattened. Some light offsetting from being folded, as typical.