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An inclined tourbillon changes the angle of the regulating mechanism, exploring how a watch’s orientation affects its rate. Revolution Watch’s Masters of Chronometry episode 3 traces the idea from a Boston pocket watch associated with Andrew Holden Potter to Walter Prendel’s more elaborate construction and modern wristwatch designs.
Why tilt a tourbillon?
Revolution frames the question around Abraham-Louis Breguet’s tourbillon and what happens when it is tilted: how might the regulating mechanism behave when a watch is laid flat, held at an angle or worn on a moving wrist? The episode describes the conventional tourbillon’s aim as averaging positional errors in a pocket watch held vertically, then considers how that idea applies as orientation changes. This is the episode’s account of the mechanism’s purpose, not a claim that every tourbillon improves everyday accuracy.
Andrew Holden Potter and the early inclined-balance design
The episode’s historical opening identifies Andrew Holden Potter, a Boston watchmaker, with an early inclined-balance tourbillon. It also warns that his work has been confused with that of Albert Henry Potter. The synopsis gives no date for Potter’s device, so its chronology should be understood as the episode presents it rather than assigned a more precise year.
Walter Prendel’s six-minute tourbillon
About seven decades later, according to the episode, Walter Prendel took the idea further with a six-minute tourbillon. Rather than inclining only the balance, his arrangement progressively inclined the escape wheel, pallet fork and balance at different angles. Revolution says Prendel trained under Alfred Helwig at the German Watchmaking School in Glashütte.
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The distinction is structural: the Potter example is described as an inclined-balance tourbillon, while Prendel’s account involves three escapement components at successively different inclinations. The six-minute period is the rotation period named for Prendel’s tourbillon; the synopsis does not provide a comparable rotation period for the other examples it names.
Greubel and Forsey bring inclination to the wrist
Revolution presents Robert Greubel and Stephen Forsey’s Double Tourbillon 30° as a modern application of inclination in a wristwatch. The episode reports that it scored 915 out of 1,000 points at the 2011 Concours International de Chronométrie. That is the one specific competition result in the synopsis; it should not be treated as a general accuracy figure for tourbillons or as a result shared by the other watches discussed.
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Other inclined and multi-axis approaches in the episode
The episode widens its account beyond the Double Tourbillon 30°. It names several makers and designs, but gives no common test results or detailed specifications for them. The comparison below is limited to what its synopsis states.
| Example | What the episode identifies | Reported chronometry result |
|---|---|---|
| Andrew Holden Potter’s early design | Boston pocket-watch context; an inclined balance. The synopsis gives no exact date. | Not stated by Revolution’s episode page. |
| Walter Prendel’s six-minute tourbillon | Escape wheel, pallet fork and balance progressively inclined at different angles; associated with his training under Alfred Helwig in Glashütte. | Not stated by Revolution’s episode page. |
| Greubel and Forsey Double Tourbillon 30° | Modern wristwatch application of inclination. | 915 out of 1,000 at the 2011 Concours International de Chronométrie, as reported by Revolution. |
| Greubel Forsey Tourbillon 24 Secondes | Named as a later example; the synopsis does not describe its component arrangement. | Not stated by Revolution’s episode page. |
| Greubel Forsey Tourbillon Cardan | Named as a later example; the synopsis does not describe its component arrangement. | Not stated by Revolution’s episode page. |
| Éric Coudray’s work | Named among the later examples; no particular mechanism details are supplied in the synopsis. | Not stated by Revolution’s episode page. |
| HYT Conical Tourbillon | Named as a later example; the synopsis does not describe its component arrangement. | Not stated by Revolution’s episode page. |
| Jaeger-LeCoultre Heliotourbillon | Named as a later example; the synopsis does not describe its component arrangement. | Not stated by Revolution’s episode page. |
| ArtyA Complexity | Described as having two inclined Cônillon tourbillons linked by a differential. | Not stated by Revolution’s episode page. |
What this history does—and does not—show
The through-line is a changing orientation of the regulating mechanism: from Potter’s inclined balance, through Prendel’s differently inclined escapement components, to wristwatch interpretations that the episode associates with multiple makers. These are distinct design approaches, not a controlled comparison of timekeeping. Apart from the Double Tourbillon 30° result reported for the 2011 competition, the synopsis supplies no comparable accuracy data, shared test protocol, prices or current availability for the named models.
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The episode is Revolution Watch’s publisher account of the history and designs, rather than primary documentation for the historical inventions or a technical specification sheet. Read its descriptions and chronology as the program’s framing of the subject.
Read Revolution Watch’s episode page: “The Complete Story of the Inclined Tourbillon | Masters of Chronometry EP 3” (published October 2, 2026).
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