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James Smallman (1763?-1821) was born in Staffordshire, emigrated to the USA, and died there in 1821.
1793-4 James Smallman was sent to the Netherlands by Boulton and Watt to erect a pumping engine to reclaim the Mijdrecht Lake (Mijdrechtse Poel). It seems that he was then lured to the USA with other B&W or ex-B&W men.
After helping to erect the first Boulton and Watt engine in America, he and several other B&W-trained engineers were hired by Nicholas J. Roosevelt (1767-1854) when he established a foundry, machine shop, and smelting works at Belleville, which he named Soho Works, after those of Boulton & Watt in Birmingham, England. The others were Charles Stoudinger, John Hewitt (1777-1857), and the Rhodes family - Frederick, George, and Lewis Rhodes)..
In 1802 Smallman was listed as a steam engine maker in Philadelphia. In 1806 he built a 6 HP engine for a flour mill in Cadiz, Spain, apprently the first steam engine to be exported from the USA.