Theory of Machine
A Hartnell governor is a

Inertia governor
Spring loaded governor
Pendulum type governor
Dead weight governor

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of double slider crank chain
Second inversion of single slider crank chain

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Theory of Machine
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ
m.ω².r (cos 2θ/n)
m.ω².r cosθ
m.ω².r (sin 2θ/n)

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