The pivots are very fine ( the 18th century clockmakers considered more pivots were thin more the mechanic system was soft and regular, but with hindsight this was not confirmed, on the other hand, because of the fine pivots, these movements are very delicate to repair ).
The striking-work controls are implanted at the front of the mechanism ( which is quite normal for the beginning of the 18th century )We are in presence of high standard masterpiece :
The hour snail striking-work, visible on the left of the dial's center, is "unmiscomptable" becausethe snail's ratchet is driven hourly by a clinched pin in the thickness of the cannon-pinion's wheel. The starry ratchet is held in position by a steel latch settling, at each jump, in one of the ratchet's hollows, interdependent with the snail.
The striking-work is triggered when the detent-arm is released by the quarter rack at the hourly four tone striking-work.
The rack rewinds at each ton
e back to it's high resting position, to fall back down on to the snail during the preparation of the next hour's striking-work.
Quarter's striking-work is operated by a return wheel with the same number of teeth than the cannon-pinion's one, in which it gears, this wheel is interdependent with the four quarter's snail, four pins clinched into the snail's body releases the detent-arm which controls the quarter racks.
Striking-work on hours and quarters, on two spiraled steel "gongs" made at the time by the clockmakers on their turning machine then hardened, the spiral's length and thickness determines the tone.
This system of independent striking-work allowed this Master clockmaker to design a tone that can be changed by a pull-out piece, very useful at the time ... for the insomniacs “eager to save the effort.”
Rack striking-works were used on clocks of high quality up to the end of "Paris Movements”.