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Question: the natural frequency of oscillation of the balance wheel in...

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The natural frequency of oscillation of the balance wheel in a watch depends on the moment of inertia of the wheel and the spring constant of the (torsional) hairspring. A temperature rise results in a reduced spring constant, which lowers the oscillation frequency. Propose a compensating means for this effect. Non-temperature-sensitive hairspring material is not an acceptable solution
(Q 2.10 in book Measurement system by Ernes O. Doeblin)

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