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mechanical watch click to hear : mechanical watch

Set of geared wheels that reduce the force transmitted by a spiral spring to cause the watch’s hands to rotate.
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jewel escape wheel hairspring center wheel ratchet wheel click winder third wheel fourth wheel

jewel click to hear : jewel

Very hard stone (formerly a ruby, today a rock crystal) that resists wear; the rotation axle of a wheel rests on it.

escape wheel click to hear : escape wheel

Last wheel of the gear train with special teeth that causes the watch to operate regularly and continuously; it controls the movement of the other wheels.

hairspring click to hear : hairspring

Flat spiral spring that causes the wheels of a watch to move over a certain period of time.

center wheel click to hear : center wheel

Wheel that is connected to the hands and causes them to rotate on the dial.

ratchet wheel click to hear : ratchet wheel

Toothed wheel having only one direction of rotation; it is kept in place by the click.

click click to hear : click

Small lever that is engaged between the ratchet-wheel teeth and prevents it from rotating counter to its normal direction.

winder click to hear : winder

Part that rewinds the mechanism, consisting of a series of wheels.

third wheel click to hear : third wheel

Wheel that receives energy from the fourth wheel and drives the center wheel.

fourth wheel click to hear : fourth wheel

Wheel that transmits energy to the third wheel.