The anchor escapement, also called the recoil escapement, drives a pendulum with two pallets on a pivoted anchor. It cuts recoil compared with a verge and does not eliminate it.
Anchor escapement: recoil and its price
issue ISSUE 01checked 2026-09-16responsible Escapement Papers (a named bench, not a person)
tape card: where the recoil goes
| Quantity | Recoil escapement | Deadbeat |
|---|---|---|
| Pendulum arc | 2-4 degrees | 2-4 degrees |
| Recoil per beat | Present, small | None |
| Rate against drive force | Still sensitive | Nearly insensitive |
| Escapement error | Present | Largely removed |
What the anchor does
An anchor escapement puts two pallets on a single pivoted piece above the pendulum, so the pendulum only has to move the anchor a little and the anchor does the work of engaging the escape wheel. Because the pallets are angled, the wheel is pushed back a small amount rather than a large one, and the pendulum's arc can be made much smaller than a verge's.
| Change from the verge | Effect on the pendulum | Effect on the rate |
|---|---|---|
| Pivot above the pendulum | Small arc is enough | Less circular error |
| Angled pallets | Less recoil | Better rate stability |
| Smaller arc | Lower air resistance | Smaller error from the arc itself |
Recoil is reduced, not removed
The anchor is still a recoil escapement. Every beat pushes the wheel back a little, and the rate still depends on how hard the train is pushing. That dependence is why the next step — the deadbeat — mattered, and why a recoil clock's rate improves when its drive force is made more constant.
Circular error is the reason a small pendulum arc matters: a pendulum's period depends slightly on how far it swings, so a smaller arc is a more consistent period. That is a pendulum property, not an escapement property, and the anchor is what made the small arc practical.
Boundary: anchor, deadbeat and lever are three different things
The anchor and the deadbeat are both pendulum escapements and differ in whether the pallet faces are curved to eliminate recoil. The lever drives a balance, not a pendulum. Calling a deadbeat anchor an improved anchor is reasonable; calling a lever an anchor is not.
The misreading to name: assuming that because the anchor reduced recoil, a clock with an anchor has no escapement error. It has less, and less is not none.
Where this bench will argue
The bench holds that the recoil escapement's bad reputation overstates the case, because a recoil clock with a well-regulated drive runs better than a deadbeat clock with a varying one. The escapement sets a floor on the error; the drive decides whether you reach it.
References
- Ref 1Precision, Horopedia – Watchmaking Encyclopediasupports the precision framing used to compare the two pendulum forms
- Ref 2Regulator: Precision Timekeeping Device, Fondation de la Haute Horlogeriesupports the regulator's role in the rate the anchor delivers
- Ref 3Mechanical Principles of a Watch, Horopediasupports the mechanical principles the anchor's pallet angles rely on
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Set this page down Set this page down when you know whether the clock recoils. If it does, the drive force is part of the rate.