James Watt invented steam engine & it is invented in 1769
James Watt's invention was the steam engine but more improved.
it was invented by James watt
He invented the steam engine to make transportation easier.
he invented todays steam engine
He invented the steam engine
James Watt biult the steam engine in the 1770
he invented it on June 21 1995
James Watt was the name of that scientist.