Well, nobody's perfect (from Some Like It Hot, directed by Billy Wilder)
page 141: The first Newcomen engine was erected in 1712 and not in 1702, but some historian think that since 1702 the first working tests were performed.
"It is possible that the first Newcomen engine was in Cornwall. Its location is uncertain, but it is known that one was in operation at Wheal Vor mine in 1715. The earliest examples for which reliable records exist were two engines in the Black Country, of which the more famous was that erected in 1712 at the Conygree Coalworks near Dudley, This is generally accepted as the first successful Newcomen engine, but it may have been preceded by one built a mile and a half east of Wolverhampton. Both these were used by Newcomen and his partner John Calley to pump out water-filled coal mines" (Wikipedia)
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