No turret clock without either a train remontoire or a gravity escapement will approach that degree of accuracy.
The arc of vibration is more equal in this than in any other gravity escapement.
It was for use in this clock that Denison invented his gravity escapement.
Beat PinsThe pins at the ends of the pallets in a gravity escapement which give impulse to the pendulum.
It has been superseded by the gravity escapement for large clocks and is inferior to the dead-beat for small.