Clock type · Specialist

Weight-Driven Clocks

Verified

A mechanism category describing clocks powered by one or more falling weights acting through a cord, chain or rope, delivering an essentially constant driving force for as long as the weight has room to fall.

Movement & mechanism

Weight suspended on a line wound around a barrel; the weight's fall drives the going (and, where fitted, striking) train
Driving force remains close to constant throughout the fall, an advantage over spring drive for precision timekeeping
Running duration set by the height available for the weight to fall — a defining practical constraint for longcase and tower clocks

Identification

Visible weight(s) and pulley/line system inside the case, most obvious in longcase and wall clocks
Case height or depth is often dictated directly by the weight's required drop

Terminology

Drop — the distance a weight can fall before needing rewinding
Barrel — the drum around which the weight line is wound

Known variations

Single-weight (time only)
Multi-weight (time, strike, chime)

Collecting notes

As with spring-driven clocks, this is a mechanism category collected via its specific forms (longcase, wall, tower); weight-driven regulators are particularly prized for their steadier motive force.

Saw clock driven by its own weight along a saw-tooth bar, late Gustavian, c. 1800, gilt bronze and Kolmarden marble - Nordiska museet - Stockholm, Sweden - DSC09979 — Daderot, CC0. Wikimedia Commons file page

Sources & references

Britten, F. J., Old Clocks and Watches and Their Makers

Where sources disagree, the disagreement is stated rather than resolved silently.