What mechanism did James Watt develop to convert linear pumping motion into circular motion for factories?

Answer

The sun and planet gear

The sun and planet gear mechanism was developed by Watt specifically to convert the up-and-down motion of the piston beam into the circular motion required to drive factory machinery.

What mechanism did James Watt develop to convert linear pumping motion into circular motion for factories?
inventionHistorymachinepowerSteam