# Wrist Watch Structure

Topics: Clock, Mechanical watch, Balance wheel Pages: 2 (285 words) Published: February 26, 2010
THE TOP PLATE
The Movement as Seen from the Back of the Watch
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THE BOTTOM PLATE
*The* Dial Side of the Movement
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THE KEYLESS WORKS
Winding and Hand-Setting
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THE MOTION WORKS
The Hour, Minute and Second Hands
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The Cannon Pinion, Hour Wheel, Minute Wheel and Wheel Pinions {draw:rect}
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The illustration above shows the motion works of a center-seconds watch. (1) The fourth wheel pinion, which carries the seconds hand. (2) The center wheel pinion, which carries the cannon pinion. (3) The cannon pinion, which carries the minutes hand. (4) the hour wheel, which carries the hour hand. {draw:frame}

The second illustration diagrams the power flow from movement to hands. (A) The movement plate. (B) The center wheel. (C) The fourth wheel. (D) The cannon pinion. (E) The hour wheel. (F) The minute wheel. You can follow the power flow with the red numbers, 1 through 8. {draw:frame}

The Balance Wheel: Amplitude
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Amplitude may be measured with an electronic timer, or may be visually estimated. In the illustration the balance is in its centered (rest) position. The clockwise travel of one spoke (bottom) is indicated. Normally, the spoke will travel to between 275 and 315 degrees before reversing its direction, returning to center, and traveling 275 to 315 degrees counterclockwise. The Balance Wheel in Detail

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*THE ESCAPEMENT: Escape Wheel,*
Pallets and Balance Staff
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The Mainspring, Mainspring Barrel, Barrel Arbor, Ratchet and Crown Wheel {draw:rect}

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The Wheel Train
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Screws
*The* Various Screws Used in the Watch
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