A negro mathematician; born in Maryland
, Nov. 9, 1731.
He taught himself mathematics; and for many years, while engaged in daily labor, made the necessary calculations for and published an almanac for Maryland
and the adjoining States.
presented one of his almanacs to the French Academy of Sciences, where it excited wonder and admiration, and the African almanac
became well known to the scientific circles of Europe
In 1790 he was employed by the commissioners in the survey of the boundaries of the District of Columbia.
His grandmother was an Englishwoman, who purchased a small plantation in Maryland
, bought two slaves from a ship just from Africa
and married one of them.
He died in Baltimore
, in October, 1806.