Theory of Machine
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

Wilson Hartnell governor
Hartung governor
Pickering governor
Inertia governor

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Theory of Machine
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

(1/2). μ W cosec α (r₁ + r₂)
(1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3).μ W cosec α (r₁ + r₂)
(2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

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