Benjamin Boardley (1830 – 1904) – Steam engine for ships
Benjamin Boardley was born into slavery around 1830 and taught himself to read and write with the help of his master’s children. He showed an early talent for invention, which led his master to recommend him to the United States Naval Academy in Maryland. Boardley’s first job at the academy was as an assistant in the Department of Natural and Experimental Philosophy, making him the first African American to hold a non-menial position there.
While working in the department, Boardley developed the first steam engine on a ship. Unfortunately, due to his status as an enslaved person, he could not legally apply for or be granted a patent for his invention. As a result, Boardley sold the rights to his invention and used the proceeds to purchase his freedom from slavery.