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Tourbillon Gowland / Gowland Free-Balance escapement
In this escapement the impulse is transmitted through the balance-spring, the unlocking is effected by a discharging pallet mounted on the balance staff. The outer end of the balance spring is attached to a stud carried on a cross-bar which is revolved slow!)' around the balance by the action of the train, the amount of its advance at every beat being limited by a circle of step-cut projections on the top-plate, against which a locking pallet carried at the end of the bar engages, until unlocked by the discharging pallet on the next swing. There is little merit in this escapement, and it never came into practical use. The use of a discharging pallet to effect the unlocking allows of the impulse being given at or near the dead-point, but involves an abandonment of the principal feature of this class of escapements that of suppressing all obstacles to the unrestricted motion of the balance
(THE MARINE CHRONOMETER ITS HISTORY AND DEVELOPMENT Lt.-Commander RUPERT T. GOULD)
Musique : Triskel - Waterpearl