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Governor (device)
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<p>A governor, or <a href="/facts/Speed_limiter/f4KfWL3Q">speed limiter</a> or controller, is a <a href="/facts/Machine/Dq1W2kwI">device</a> used to measure and regulate the <a href="/facts/Speed/I3qgMPfs">speed</a> of a <a href="/facts/Machine/Dq1W2kwI">machine</a>, such as an <a href="/facts/Engine/p0m7aXaW">engine</a>. </p><p>A classic example is the <a href="/facts/Centrifugal_governor/c4DE9hF0">centrifugal governor</a>, also known as the <a href="/facts/James_Watt/29KvGNW0">Watt</a> or fly-ball governor on a reciprocating steam engine, which uses the effect of <a href="/facts/Inertia/bzK9uzI2">inertial force</a> on rotating weights driven by the machine output shaft to regulate its speed by altering the input flow of steam. </p>