Benjamin Banneker - Notable Works

Notable Works

In 1753 at the age of 22, Banneker completed a wooden clock that struck on the hour. He appears to have modeled his clock from a borrowed pocket watch by carving each piece to scale. The clock continued to work until Banneker's death.

After his father died in 1759, Banneker lived with his mother and sisters. In 1771, the Ellicott family moved to the area and built mills along the Patapsco River. Banneker supplied their workers with food and studied the mills. The Ellicotts were Quakers and shared the same views on racial equality as did many of their faith. George Ellicott lent Benjamin Banneker books and equipment to begin a more formal study of astronomy in 1788. The following year, Banneker sent George his work calculating a solar eclipse.

In February 1791, Major Andrew Ellicott, a member of the same family, hired Banneker to assist in the initial survey of the boundaries of the new federal district, which the 1790 federal Residence Act and later legislation authorized. Formed from land along the Potomac River that the states of Maryland and Virginia ceded to the federal government of the United States in accordance with the Residence Act, the territory that became the original District of Columbia was a square measuring 10 miles (16 km) on each side, totaling 100 square miles (260 km2). Ellicott's team placed boundary stones at every mile point along the borders of the new capital territory.

Banneker's duties on the survey consisted primarily of making astronomical observations at Jones Point in Alexandria, Virginia, to ascertain the location of the starting point for the survey. He also maintained a clock that he used to relate points on the ground to the positions of stars at specific times. However, at age 59, Banneker left the boundary survey in April 1791 due to illness and difficulties completing the survey. He returned to his home at Ellicott's Mills to work on an ephemeris. Andrew Ellicott continued the survey with his brothers Benjamin and Joseph Ellicott and other assistants through 1791 and 1792.

At Ellicott's Mills, Banneker made astronomical calculations that predicted solar and lunar eclipses for inclusion in his ephemeris. He placed the ephemeris and its subsequent revisions in a number of editions in a six-year series of almanacs which were printed and sold in six cities in four states for the years 1792 through 1797: Baltimore; Philadelphia; Wilmington, Delaware; Alexandria, Virginia; Petersburg, Virginia; and Richmond, Virginia. He also kept a series of journals that contained his notebooks for astronomical observations and his diary. The notebooks additionally contained a number of mathematical calculations and puzzles.

The title page of an edition of Banneker's 1792 Pennsylvania, Delaware, Maryland and Virginia Almanack and Ephemeris stated that the publication contained:

the Motions of the Sun and Moon, the True Places and Aspects of the Planets, the Rising and Setting of the Sun, Place and Age of the Moon, &c.—The Lunations, Conjunctions, Eclipses, Judgment of the Weather, Festivals, and other remarkable Days; Days for holding the Supreme and Circuit Courts of the United States, as also the useful Courts in Pennsylvania, Delaware, Maryland, and Virginia. Also—several useful Tables, and valuable Receipts.—Various Selections from the Commonplace–Book of the Kentucky Philosopher, an American Sage; with interesting and entertaining Essays, in Prose and Verse—the whole comprising a greater, more pleasing, and useful Variety than any Work of the Kind and Price in North America.

In addition to the information that its title page described, the almanac contained a tide table for the Chesapeake Bay region. That edition and others listed times for high water or high tide at Cape Charles and Point Lookout, Virginia and Annapolis and Baltimore, Maryland.

In his 1793 almanac, Banneker included letters sent between Thomas Jefferson and himself. The title page of a Baltimore edition of his 1795 almanac had a woodcut portrait of him as he may have appeared, but which a writer later concluded was more likely a portrayal of an idealized African American youth.

The almanacs' editors prefaced the publications with adulatory references to Banneker and his race. The 1792 and 1793 almanacs contained lengthy commendations that James McHenry, a signer of the United States Constitution and self-described friend of Banneker, had written in 1791. A 1796 edition stated:

Not you ye proud, impute to these the blame
If Afric's sons to genius are unknown,
For Banneker has prov'd they may acquire a name,
As bright, as lasting, as your own.

Supported by Andrew, George and Elias Ellicott and heavily promoted by the Society for the Promotion of the Abolition of Slavery of Maryland and of Pennsylvania, the early editions of the almanacs achieved commercial success. After these editions were published, William Wilberforce and other prominent abolitionists praised Banneker and his works in the House of Commons of Great Britain.