Breguet Overcoil Terminal Curve Lookup
Return the documented geometry, date, purpose, breathing intent, or limitation of a Breguet overcoil terminal curve.
Description
A Breguet overcoil changes the terminal geometry of a hairspring to influence its breathing.
A Breguet overcoil changes the terminal geometry of a hairspring to influence its breathing. The named curve does not specify every spring’s dimensions.1
Return the documented geometry, date, purpose, breathing intent, or limitation of a Breguet overcoil terminal curve.
When to use Breguet Overcoil Terminal Curve Lookup
Use this tool to return the documented geometry, date, purpose, breathing intent, or limitation of a Breguet overcoil terminal curve.
Choose a supported reference focus or prepare the watch measurements, evidence and explicit limits requested. Confirm units and date conventions before running.
How to use Breguet Overcoil Terminal Curve Lookup and understand its results
- Choose a supported reference focus or prepare the watch measurements, evidence and explicit limits requested. Confirm units and date conventions before running.
- Enter overcoilFocus using the field table and calculation rules, then run the tool.
- Read keyDate, overcoilFocus, verifiedStatement. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| overcoilFocus | Breguet overcoil focus | string; one of "geometry", "breathing", "purpose", "limitation" | Required |
Select an exact supported overcoilFocus value from the field table and run the lookup. The implementation selects a fixed local table entry and returns the fields shown below. Matching is case-sensitive, with no trimming, synonyms or free-text search. Any keyDate output can be a date, period or context label.
result=stored entry for selected focus Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| keyDate | Key date or category | string |
| overcoilFocus | Breguet overcoil focus | string |
| verifiedStatement | Verified overcoil statement | string |
{
"input": {
"overcoilFocus": "geometry"
},
"output": {
"keyDate": "1795",
"overcoilFocus": "geometry",
"verifiedStatement": "Breguet's official history dates the raised, inward-curved final coil to 1795."
}
}Limitations and assumptions
No geometry, isochronism or improvement is measured. No sources are fetched or statements updated at runtime.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Hairspring Concentric Breathing Change Calculator: Calculate the diameter envelope of a modeled concentric breathing hairspring excursion without inferring spring geometry from a terminal-curve name. For a complementary task, use Free Sprung Index Regulator Comparison Lookup: Return free-sprung inertia adjustment, index curb-pin adjustment, isochronism control, service tradeoff, or non-absolute accuracy fact.
References
-
Breguet Overcoil Terminal Curve Lookup — tool.io
Similar or alternative tools
- Hairspring Concentric Breathing Change Calculator
Calculate the diameter envelope of a modeled concentric breathing hairspring excursion without inferring spring geometry from a terminal-curve name.
- Free Sprung Index Regulator Comparison Lookup
Return free-sprung inertia adjustment, index curb-pin adjustment, isochronism control, service tradeoff, or non-absolute accuracy fact.