Benjamin Franklin's Chart of the Gulf Stream. Prepared by 

 Frankhn in 1769 to aid the English captains of the mail packets 

 in speeding their trip across the Atlantic. Subsequently published 

 in 1786 in the Transactions of the American Philosophical 

 Society, Franklin's chart, for reasons of economy, was combined 

 in one plate with another chart (shown in the upper left) 

 illustrating the annual migrations of herring. 



