John Jeffries II

American physician and balloonist

John Jeffries II

John Jeffries II (February 5, 1744 – September 16, 1819) was an American physician, scientist, and pioneering balloonist. He is best known for his early work in aeronautics and his contributions to meteorology.

Early life and education

John Jeffries II was born in Boston, Massachusetts, in 1744. He was the son of Dr. David Jeffries, a prominent physician in Boston. Jeffries pursued his education at the Boston Latin School and later attended Harvard College, where he graduated in 1763. He continued his medical studies at the University of Aberdeen in Scotland, earning his medical degree in 1769.

Medical career

Upon returning to Boston, Jeffries established a successful medical practice. He became known for his work during the American Revolutionary War, where he served as a surgeon for the British Army. Despite his loyalist sympathies, Jeffries was respected for his medical expertise and dedication to his patients.

Ballooning and scientific contributions

Jeffries is perhaps most famous for his involvement in early balloon flights. On January 7, 1785, he and French balloonist Jean-Pierre Blanchard made a historic flight across the English Channel from Dover to Calais. This flight was significant as it was one of the first successful crossings of the Channel by air. During the flight, Jeffries conducted various scientific experiments, including measuring atmospheric pressure and temperature at different altitudes, contributing valuable data to the field of meteorology.

Later life and legacy

After his adventures in ballooning, Jeffries returned to Boston, where he continued his medical practice. He remained active in the scientific community, contributing to various medical and scientific societies. Jeffries passed away in 1819, leaving behind a legacy as a pioneer in both medicine and aeronautics.

Related pages

• Ballooning
• Meteorology
• American Revolutionary War
• Harvard College