England · Early form associated with Tompion c. 1695; Graham's refined version from c. 1726
Cylinder Escapement
Historical attributionThe cylinder escapement enabled noticeably slimmer pocket watches than the verge and remained in mass production (particularly for lower- and mid-priced watches) well into the 19th century, before being displaced by the lever escapement.
The cylinder escapement replaces the verge's crown wheel and pallets with a slotted steel or ruby cylinder mounted on the balance staff, through which the escape-wheel teeth pass alternately, giving a flatter movement than the verge and allowing thinner watches.
George Graham is credited with developing the escapement into a reliable, commercially viable form, and it was subsequently manufactured in very large numbers, particularly by French and Swiss makers through the 18th and 19th centuries.
Background
The horizontal or cylinder escapement was invented by Thomas Tompion in 1695 and subsequently perfected by George Graham in 1726. It was developed as one of several mechanisms intended to replace the verge escapement in pocketwatches after 1700. A primary motivation for its adoption was its significantly reduced thickness compared to the verge escapement, which allowed for the creation of fashionably slim watches.
The mechanism operates as a frictional-rest escapement where the oscillator remains in contact with the escape teeth throughout the entirety of the cycle. Each wedge-shaped tooth impulses the balance wheel by applying pressure to the edge of the cylinder as it enters, is held within the cylinder during its turn, and provides further impulse as it exits the other side.
Written from the encyclopedia entries listed under Sources; each statement was checked against the cited text.
How it works
- The escapement utilizes a cutaway cylinder positioned on the balance wheel shaft instead of using traditional pallets.
- The escape wheel typically consists of 15 teeth that impulse the balance over an angle ranging from 20 to 40 degrees in each direction.
- French makers addressed wear concerns by manufacturing both the cylinder and the escape wheel from hardened steel.
Later history
- The escapement saw extensive use in inexpensive French and Swiss pocketwatches and small clocks from the mid-19th century into the 20th century.
How to verify this yourself
No single modern-style patent specification exists for this pre-1852 English mechanism; verify attribution and dating against horological history references and dated surviving examples in museum catalogues rather than trade folklore.
Manufacturers known to have used it
- Many French and Swiss établissage houses, 18th–19th centuries
- some English makers
Photographs
Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.
Sources & references
- Escapement, Wikipedia (English), retrieved 2026-10-28 (text CC BY-SA 4.0)
- Britten, F. J., Old Clocks and Watches and Their Makers
- Antiquarian Horological Society, published research on the cylinder escapement
Where sources disagree, the disagreement is stated rather than resolved silently.