The 1903 America's Cup was the 12th challenge for the Cup. It took place in the New York City harbor and consisted of a best of five series of races between Reliance, the fourth of Nathaniel Herreshof
Reliance (left) and Shamrock III (right) before the race
Nathanael Greene Herreshoff was an American naval architect, mechanical engineer, and yacht design innovator. He produced a succession of undefeated America's Cup defenders between 1893 and 1920.
Herreshoff circa 1898
New York 30 class design
Nathanael Herreshoff climbing aboard Defender in 1895; photograph by John S. Johnston