decisive battle of the American Revolution. Shortly after that battle, Major Sebastian Bauman commissioned Robert Scot to engrave a map that illustrated the American victory, titled "Investment of York and Gloucester," a magnificent work with elaborate artistry and a factual description of the battle. Scot would continue to engrave for American officers, for the Society of the Cincinnati, and for an accurate 1784 map of United States for Captain William McMurray, based on the 1783 Treaty of Paris. As a Freemason, Robert Scot engraved the frontispiece for Ahiman Rezon, dedicated to General George Washington, for the Grand Lodge of Philadelphia. Scot also reproduced Charles Willson Peale's 1772 portrait of Washington as an authorized drawing and line engraving, while visiting at Mount Vernon. While in Philadelphia, Robert Scot and his family were members of the Religious Society of Free Quakers, a radical sect of ardent patriots who were disowned by the pacifist Philadelphia Quakers for their constant support of the American Revolution. Other members included Timothy Matlack, the probable scribe of the Declaration of Independence, and seamstress Elizabeth Claypoole, better known as Betsy Ross. The Great Seal of the United States The Declaration of Independence of the United States initiated a requirement for a national seal that would represent the sovereignty of the United States of America. After three design committees had not yet completed the design work for the Great Seal, Secretary of Congress Charles Thomson was given the assignment to complete the design in June 1782. Thomson's design utilized many of the features of the committees' work, and was approved by Congress on June 20, 1782. The engraver for the original Great Seal die was attributed as Robert Scot by Richardson Dougall and Richard Patterson in their book, The Eagle and the Shield. The primary source of their attribution was a note by Thomson for payment of a seal to Robert Scot. The only seal that Thomson is known to have been involved with is the Great Seal. Other evidence includes exact stylistic and technical attributes of Robert Scot's engravings to the Great Seal die, including a star constellation for the Commissioner of Revenue seal, the eagle for 1782 frontispiece engraving of Ahiman Rezon, and borders on a 1783 seal for the College of William and Mary. Book illustrations Robert Scot engraved 25 copperplates of scientific illustrations for Thomas Dobson's 1788 American reprint of William Nicholson's Natural Philosophy. These