The movement
Calibre I.01
Thirty millimetres across, 4.6 high, one hundred and forty-one parts on five levels. Choose a level to see it alone.
Specification
In numbers
- Diameter
- 30.00 mm 13¼ lignes
- Height
- 4.60 mm
- Frequency
- 28,800 A/h 4 Hz · 8 beats a second
- Power reserve
- 72 hours single barrel, about ten turns
- Jewels
- 21 rubies
- Escapement
- Swiss lever 20-tooth escape wheel, one turn every 5 s
- Balance
- Three arms, 12 gold timing screws 280° amplitude
- Hairspring
- Flat, heat-blued steel 12½ turns
- Functions
- Hours, minutes, small seconds hand-wound, stop-seconds
- Finishing
- Côtes de Genève, perlage, anglage flame-blued screws, black-polished regulator
- Regulation
- ± 2 s a day six positions · 8, 23, 38 °C
- Parts
- 141
One beat, slowed forty times
An eighth of
a second
The list below follows the mechanism on the left as it runs. Most of the time nothing touches the balance at all — that freedom is what keeps the rate steady.
- 01
Free swing
The fork rests against its banking pin. The balance swings out on its hairspring, touching nothing, for nearly all of the beat.
- 02
Unlocking
Coming back through the centre, the impulse jewel on the roller strikes the fork's horn and draws a pallet stone off the escape tooth.
- 03
Impulse
The freed tooth slides across the pallet's face and pushes the fork, which pushes the balance: the energy of the mainspring, delivered in a fiftieth of the swing.
- 04
Drop & lock
The wheel jumps forward half a tooth and stops against the other pallet. Click. The escape wheel has turned 9°.
Going train
From one turn
in seven hours
to one turn in five seconds. Each wheel drives the next one's pinion; multiply the ratios and the barrel's slow unwinding becomes the escape wheel's steady step.
| Wheel | Teeth | Pinion | Ratio to next | One turn in |
|---|---|---|---|---|
| Barrel | 84 | — | 84 / 12 = 7 | 7 h |
| Centre | 80 | 12 | 80 / 10 = 8 | 1 h |
| Third | 75 | 10 | 75 / 10 = 7.5 | 7 min 30 s |
| Fourth · small seconds | 84 | 10 | 84 / 7 = 12 | 1 min |
| Escape | 20 | 7 | 40 beats a turn | 5 s |