Dead-beat (Graham) escapement: escape wheel and anchor — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/deadbeat-escapement-mechanism/  (CC BY 4.0)
Basis: Xem Studio design following Brown No. 289 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- An anchor rocked by a pendulum lets the escape wheel advance one tooth every two beats: a tooth is locked on one pallet, released as the anchor swings, gives the pallet a small push across its slanted impulse face, and the wheel drops until the other pallet catches the next tooth.
- Dead-beat (Graham, 1715): the locking faces are arcs about the anchor pivot, so while a tooth rests on them the wheel stands perfectly still (the seconds hand does not recoil) and the pendulum swings freer — the escapement of precision regulators.
- Drawn with a tooth tip resting on the entry pallet's locking face (contact only, wheel turned -4.83°). Brown's No. 289.
- Parts (each has its own page): escape-wheel-30t-d50, deadbeat-anchor-for-30t-d50, dowel-pins-metric.
- Brown's movement No. 289 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
escape wheel  30 T, Ø50
anchor span  7½ teeth
pivot height  35.36 mm
beats  2 per tooth (60 per wheel turn)
type  dead-beat

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 289: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_289.html

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/deadbeat-escapement-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=deadbeat-escapement-mechanism