Broom, Jacob (1752-1810) Signer of the Constitution: Jacob Broom was born in Wilmington, Delaware. A mathematician and surveyor, his maps were used in the Battle of Brandywine. From 1776 to 1785, he was a burgess of Wilmington. While serving in the state legislature, he was sent to the 1787 Philadelphia Convention, where he signed the Constitution. In 1795, he established the first cotton mill in the Brandywine region. Broom later served as director of the Delaware Bank. He died in Philadelphia, Pennsylvania, on April 25, 1810.