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Mechanism Of Wrist Watch. A Mechanical Watch Is A Watch That Uses A Mechanical Mechanism To Measure The Passage Of Time, As Opposed To Modern Quartz Watches Which Function Electronically. It Is Driven By A Spring (Called A Mainspring) Which Must Be Wound Periodically. Its Force Is Transmitted Through A Series Of Gears To Power The Balance Wheel, A Weighted Wheel Which Oscillates Back And Forth At A Constant Rate.