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November 13, 1809 - John A. Dahlgren, US Navy officer and inventor (Civil war Dahlgren-cannon), born in Philadelphia, Pennsylvania (d. 1870)
www.history.navy.mil
John A. Dahlgren
The “father of American naval ordnance” was born in Philadelphia on 13 November 1809. John A. Dahlgren was appointed a midshipman in the U.S. Navy in 1826. Six years later, due to his mathematical proficiency, the Navy ordered him to the U.S. Coast Survey, where he worked as a scientist from...
