Thomas, Seth, 1785–1859, American clock manufacturer, b. Wolcott, Conn. In 1812 he sold his partnership in a clock business established by Eli Terry and set up a factory to make metal-movement clocks at Plymouth Hollow, Conn. (renamed Thomaston in his honor c.1860). He also built and operated a mill to roll brass and make wire for his clock factory. The business was continued and expanded by his son, Seth Thomas (1816–88), and the clocks they manufactured became known throughout the world.
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