Watt didn't build the first steam engine, not even the first commercially successful steam engine. Newcomen's engine (in widespread use before Watt was even bor

Watt didn't build the first steam engine, not even the first commercially successful steam engine. Newcomen's engine (in widespread use before Watt was even born) developed about 8HP and was widely adopted by British mine owners: http://inventors.about.com/od/nstartinventors/a/Newcomen_2.htm http://inventors.about.com/od/nstartinventors/a/Newcomen_2.h...