BALDWIN, Loammi, engineer, born in Woburn, Massachusetts, 21 January 1745; died there, 20 October 1807. He received a common-school education, and, subsequently devoting his attention to mathematics, studied at Harvard under Professor Winthrop, after which he became a surveyor and engineer. He was a member of the Middlesex County convention held in August 1774. During the revolutionary war he entered the service as a major, and was in the battle at Lexington, in the battle of Long Island, and took part in the surprise of the Hessians at Trenton; but after reaching the rank of colonel he was compelled, in 1777, to retire in consequence of failing health. From 1780 to 1794 he was sheriff of Middlesex County He was a member of the Massachusetts state legislature from 1778 to 1779, and again in 1780. From 1794 to 1804 he was superintendent of the Middlesex canal, and one of its principal owners, lie was also a member of the American Academy of Sciences.*His son, Loammi, born in Woburn, 16 May 1780, died in Charlestown, Massachusetts, 30 June 1838, was graduated at Harvard in 1800, studied law, and became a civil engineer. The dry docks at Charlestown and at Newport were constructed under his supervision. Since his death a memorial of him, and of his father, has appeared from the pen of a grandson.*Another son, James Fowle, engineer, born in Woburn, Massachusetts, 29 April 1782, died in Boston, 20 May 1862, was educated at the academies in Billerica and Westford, after which he entered on mercantile pursuits in Boston, but later joined his brother in the construction of the dry dock at the Charlestown navy yard. In 1828 he was appointed one of the commissioners to make a survey for a railroad from Boston to Albany, and from 1830 to 1835 he was engaged on the construction of the Boston and Lowell railroad. He was appointed in 1837 one of the commissioners to examine and report upon the means of supplying Boston with pure water, and recommended Long Pond. His plan was adopted in 1846, and the work was completed in 1848. He was at one time state senator from Suffolk County, and also for some years water commissioner.