Arnold or Breguet? The quiet controversy behind the origin of the tourbillon
Sílvio Pereira
GREAT CONTROVERSIES IN THE HISTORY OF WATCHMAKING
For more than two centuries, the tourbillon has been celebrated as one of the most fascinating inventions in mechanical watchmaking. Yet behind this legendary complication lies a historical question that continues to intrigue scholars and collectors: was it really the isolated creation of Abraham-Louis Breguet, or did it emerge in a technical milieu strongly influenced by the English genius John Arnold?
The birth of a horological myth
Few mechanical complications carry the symbolic prestige of the tourbillon. Its presence in a watch remains, even today, a sign of technical virtuosity and craftsmanship of the highest order.
The invention is usually credited to the Paris-based Swiss watchmaker Abraham-Louis Breguet, who officially registered the patent for the mechanism on 26 June 1801. In that document, Breguet describes a system designed to compensate for the rate errors caused by gravity by making the watch's regulating assembly rotate within a moving structure.
However, when one examines the technical context of the period, another key name inevitably comes up: that of the great English watchmaker John Arnold.
Arnold was one of the leading figures in the development of chronometry in the 18th century and, in several respects, his work anticipated problems that the tourbillon would set out to solve. This raises a question that has long fuelled horological historiography: was the concept of the tourbillon influenced, directly or indirectly, by Arnold's research?
The problem that puzzled watchmakers
To understand why this debate matters, we need to go back to the main challenge facing precision watchmaking in the 18th century: positional errors.
Mechanical watches depend on an extremely delicate equilibrium between the balance and the hairspring. Any microscopic irregularity — whether in the balance pivot, the shape of the hairspring or the geometry of the escapement — can cause variations in rate.
When a watch remains in a constant position, as was often the case with pocket watches carried in a waistcoat, gravity always acts on the same points of the mechanism. This effect produces deviations that can amount to several seconds a day.
At a time when precision was vital for maritime navigation and scientific timekeeping, such errors were considered unacceptable.
Many watchmakers therefore began looking for solutions capable of neutralising or compensating for these variations.
John Arnold and the revolution in English chronometry
In the second half of the 18th century, English watchmaking dominated the field of precision chronometry. Prominent among its leading figures was John Arnold, a central figure in the development of the marine chronometer.
Arnold developed instruments designed to solve one of the greatest scientific challenges of the age: determining longitude at sea. This required extremely accurate and stable timepieces, able to withstand changes in temperature and humidity and the motion on board ship.
Inspired by the pioneering work of John Harrison, Arnold sought to simplify marine chronometers and make them more accessible. He introduced decisive improvements to the detent escapement and refined systems of temperature compensation based on bimetallic balances.
More importantly still, Arnold paid close attention to the behaviour of the regulating organ in different positions.
Although he did not develop a mechanism equivalent to the tourbillon, he was clearly investigating precisely the same physical problem that would later lead Breguet to his famous invention.
Breguet: the architect of modern watchmaking
While Arnold was working in London, Abraham-Louis Breguet was building a truly extraordinary career in Paris.
Few watchmakers in history have brought together so many innovations in a single career.
His contributions include the overcoil hairspring — known today as the Breguet hairspring — the natural escapement, improvements to repeating watches and various advances in the construction of self-winding watches.
Breguet had a rare gift for technical synthesis. Rather than inventing isolated components, he knew how to integrate different mechanical principles into an elegant, coherent solution.
The tourbillon is perhaps the most emblematic example of this approach.
The idea was to mount the balance, hairspring and escapement in a rotating cage that makes a complete turn at regular intervals, usually one minute. In doing so, the mechanism spreads positional errors across every possible orientation, allowing these deviations to cancel each other out.
It was an ingenious and deeply sophisticated solution.
A relationship marked by respect
Interestingly, the story of the tourbillon is not built on a bitter rivalry between Arnold and Breguet.
On the contrary, there is ample evidence of a relationship of great respect between the two masters.
In the late 18th century, Breguet visited London and came into contact with the leading English watchmakers. Arnold, whose reputation was immense, became a natural partner in this technical dialogue.
Both shared a common obsession: achieving ever higher levels of chronometric precision.
It is precisely this intellectual closeness that leads some historians to consider the possibility of mutual influence. Even if Arnold did not conceive the tourbillon, his thinking on positional errors may have helped shape Breguet's ideas.
The watch that kept the controversy alive
One singular episode further reinforces this interpretation.
When John Arnold died in 1799, Breguet decided to pay him a rare tribute. He built a chronometer fitted with a tourbillon and engraved on the movement an inscription dedicated to the memory of the English watchmaker.
The watch was presented to Arnold's son, John Roger Arnold, who carried on the family business.
The piece became known in horological history as Arnold No. 11.
For some scholars, this dedication may suggest that Breguet saw Arnold as an intellectual forerunner. For others, it was simply a gesture of admiration between two masters whose work profoundly transformed chronometry.
Whatever the interpretation, the episode reveals the deep professional bond between the two men.
How many tourbillons did Breguet make?
Another important element in analysing this controversy is the number of tourbillons Breguet actually produced.
The master is estimated to have made around forty examples during his lifetime. Each one demanded extremely complex work, involving minimal tolerances and craftsmanship of the very highest level.
The tourbillon was never a solution for everyday production. On the contrary, for decades it remained a demonstration of technical mastery.
In the 19th century, some makers used the system in observatory chronometers, where the quest for absolute precision justified sophisticated mechanical experiments.
Even so, the tourbillon always remained a rare complication.
The consensus among historians
Today, most experts agree on three fundamental points.
First, Abraham-Louis Breguet is unquestionably the inventor of the tourbillon, since he conceived the mechanism, registered the patent and produced the first examples.
Second, John Arnold played a crucial role in the development of chronometry, exploring many of the technical problems that would lead to the creation of the tourbillon.
Third, 18th-century watchmaking was a deeply collaborative environment. Ideas, concepts and experiments circulated between workshops, cities and countries, fuelling a continuous process of innovation.
The controversy between Arnold and Breguet should therefore be seen less as a dispute over authorship and more as a reflection of the extraordinary scientific vitality of European watchmaking at that time.
From scientific instrument to symbol of prestige
Interestingly, the role of the tourbillon has changed profoundly over the centuries.
In the early 19th century, it was a serious attempt to improve the accuracy of mechanical watches. However, later technological advances — new metal alloys, better hairsprings and more sophisticated regulating methods — reduced the practical need for the mechanism.
Even so, the tourbillon never lost its fascination.
On the contrary, it has become a kind of signature of excellence in contemporary haute horlogerie. The sight of the rotating cage performing its slow mechanical choreography remains one of the most poetic expressions of watchmaking engineering.
An invention born of a great historical era
The story of the tourbillon shows that great inventions rarely arise in isolation.
The creative genius of Abraham-Louis Breguet produced a brilliant technical solution that, more than two hundred years later, remains one of the greatest achievements of mechanical watchmaking.
Yet this invention was born in an extraordinarily fertile intellectual environment, where masters such as John Arnold were tirelessly exploring the limits of precision.
Arnold perfected the science of chronometry.
Breguet turned that science into a mechanical masterpiece.
And the tourbillon keeps on turning, century after century, as a testament to an age when human ingenuity sought — with patience, talent and imagination — to master time itself.
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