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The book has 2 equations one for the governor itself which I understand.

However, there is an equation for the steam engine flywall & Drive shaft which I don't understand. This is the equation

J * dΩ/dt = -β* Ω + τ

This is the text following the equation

J is the moment of Inertia of the flywheel

Ω - rotational speed of the engine

First term on the right is the torque due to the load & the second term on the right is the steam generated torque referred to the drive shaft.

What exactly is β in the equation? What's the unit of β?