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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“Colonial system, public debts, heavy taxes, protection, commercial wars, etc., these offshoots of the period of manufacture swell to gigantic proportions during the period of infancy of large-scale industry. The birth of the latter is celebrated by a vast, Herod-like slaughter of the innocents.”
—Karl Marx (1818–1883)
“There is a period in the history of the individual, as of the race, when the hunters are the “best men,” as the Algonquins called them.”
—Henry David Thoreau (1817–1862)
“In almost all climes the tortoise and the frog are among the precursors and heralds of this season, and birds fly with song and glancing plumage, and plants spring and bloom, and winds blow, to correct this slight oscillation of the poles and preserve the equilibrium of nature.”
—Henry David Thoreau (1817–1862)