Period of Oscillation
A balance wheel's period of oscillation T in seconds, the time required for one complete cycle (two beats), is determined by the wheel's moment of inertia I in kilogram-meter2 and the stiffness (spring constant) of its balance spring κ in newton-meters per radian:
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—Zora Neale Hurston (1891–1960)
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—Henry David Thoreau (1817–1862)