1754-1820.
Ellicott, a Quaker, was raised in Bucks County, Pennsylvania. His father was a prosperous miller whose family founded Ellicott City, Maryland in 1775. Andrew Ellicott was trained to be a mathematician and surveyor. He conducted several large surveys with David Rittenhouse, the Philadelphia astronomer, mathematician, and clockmaker. President Washington in 1791 asked Ellicott to survey the bounds of the District of Columbia. The following year Washington asked him to complete L'Enfant's plan for the city. Ellicott made some changes to L'Enfant's plan. He changed the alignment of Massachusetts Avenue, eliminated five short radial avenues, added two short radial avenues southeast and southwest of the Capitol, and named the city streets. In less than one month Ellicott had a plan ready for the engravers. A few months later Ellicott, like L'Enfant, found himself at odds with the Commissioners and resigned from the project.
Washington Map Society. Se även wikipedias artikel, 'Andrew Ellicott'.
1770-1823.
Vallance arrived in Philadelphia from Glasgow Scotland early in 1791. He quickly established his reputation as one of the best engravers in the city. During this period he developed a friendship with James Thackara. In 1791 Vallance married Elizabeth Trenchard, a niece of Thackara's wife Hannah. A partnership with Thackara was established. He engraved banknotes and documents. In addition he was one of the founders, in 1774, of the Association of Artists in America. His wife Elizabeth died in 1798 at the age of 28. Four years later he married again to Margaret Pratt.
Washington Map Society.
1744-1808. Född i Osterburg i Altmark, död i Weimar.
Tysk kartograf. Arbetade som ingenjör och utförde därefter ett flertal mätarbeten i grevskapet Mark. Senare slog han sig ned i Weimar där han särskilt utmärkte sig med lantmätningsarbeten och kartritning. Större delen av hans kartor gavs ut av de Homanska arvingarna.
Conversations-Lexicon, Khb. 1818, b. IV - Phillips.
Amiral Häggs flaggkarta. - Stockholm 1888.
Tamhöna - Olof Rudbeck d.y.
