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The Encyclopedia of Horology

Interactive reference

Watch Parts Diagram

A functional atlas of 32 components across the going train, dial side, winding system and case. Explore each component’s role, glossary definition, article explanation and reviewed close-up where available. This is a conventional mechanical watch reference, not every possible calibre or complication; positions are schematic and not to scale.

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Click a part

Mechanical watch — train view, not to scaleMainspringBalanceCentre wheelThird wheelHairspringRatchet wheelFourth wheelBridgeEscape wheel

Train-side functional layout with bridges lifted away. Bearings and optional details are enlarged or offset; it is not a meshing-geometry drawing.

Selected component

Mainspring

Stores elastic energy inside the barrel. A wound spring can release dangerously during dismantling.

The coiled spring that stores energy to drive the train.

No reviewed close-up is held for this component. The schematic identifies it without substituting an unrelated photograph.

Test yourself

Parts quiz

Mechanical watch — train view, not to scale

Question 1 of 32 · Score 0

Which part is highlighted?