Patent-pending mechanism, the four ‘Trébuchet Hammer’ can be
seen striking on the backside. They devised a dual-axis-system
with a special joint on a moveable arm. Upon activation, the
hammers are accelerated until they touch a small finger,
whereupon a second moveable arm is released, thus helping to
accelerate the hammers further shortly before the impact. This
method utilizes around 80 percent of the force applied by the
spring, whilst traditional hammer systems only deliver a mere 10
to 30 percent of the power originally applied. The watchmakers
also fitted a spiral spring for calibration and in this way
created an easy method of adjusting the hammers with one screw.