entrance pallet

This unlocks the entrance pallet allowing the wheel to rotate clockwise.

As the powered escape wheel rotates clockwise, the entrance tooth slides across the sloping impulse plane of the entrance pallet.

From the release from the entrance pallet to this point, the escape wheel will have turned through exactly one half of the 24 degree angle between two teeth.

The escape wheel drops again until the entrance tooth locks on the entrance pallet now being held in place by the left banking pin via the lever.

As shown in the diagram, the escape wheel rotates clockwise and the entrance tooth is locked in place against the entrance pallet, the lever held in place by the left banking pin.

The impulse received by the entrance pallet as the tooth moves over the impulse face is transferred by the lever to the balance wheel via the ruby impulse pin on the roller of the balance wheel.

Once the entrance tooth leaves the impulse plane of the entrance pallet, the wheel is able to turn a small amount (called the drop) until the exit tooth of the escape wheel lands on the locking face of the exit pallet.