Clock type · Public & tower

Tower Clocks

Partially verified

Large public timekeepers, usually installed in a church, civic or institutional tower, driving one or more external dials and often a striking or chiming bell mechanism.

Construction and interpretation

A tower clock is an installation as well as a movement. Its hands, dial gearing, shafts, bells and winding arrangements may be distributed through a building. The public face therefore gives little evidence about the escapement inside. A useful record separates the original movement from later winding motors, replacement hands and modern control equipment. Electrical assistance does not automatically mean that the mechanical regulator has been replaced.

Large external hands impose changing loads, including wind loading, on their transmission. Escapement design and arrangements separating the pendulum from that load are important engineering questions, not features shared by all tower clocks. Parliament’s history of the Great Clock documents the demanding accuracy requirement for that particular installation. Its specification must not be applied to anonymous turret movements. Equally, a clock tower’s construction date need not be the date of the mechanism now installed within it.

Tower Clocks: feature and evidence comparison
Feature	What it means	Evidence to seek
External dial	Public display remote from the mechanism	Hand and shaft connections
Going train	Time display drive	Separate movement identification
Strike or chime trains	Bell functions with their own power paths	Bell and hammer documentation
Electric winding	May replenish mechanical stored energy	Retained regulator and motor layout

Tower mechanisms, hanging weights and bell systems are not suitable for unsupervised inspection or operation.

Evidence to record

Record building, movement and alteration dates separately.
Document the clock’s bell connections and winding system.
Treat access and maintenance as institutional responsibilities.

Movement & mechanism

Heavy iron-framed movements historically driven by large falling weights on a rope or wire
Verge-and-foliot escapement in the earliest surviving examples, superseded by anchor and later gravity escapements
Dial(s) driven remotely from the movement via rod or shaft trains, sometimes at a considerable distance
Separate going, striking and (where fitted) chiming trains

Identification

Scale — turret movements are dramatically larger than any domestic clock
Iron (rather than brass) plates and frames are typical of pre-twentieth-century turret work
Bell(s) mounted separately from the movement, struck by external hammers

Terminology

Going train — the train that drives the hands/dials, as distinct from striking or chiming trains
Turret clock — a synonym for tower clock, especially in British usage
Great bell — the principal striking bell of a tower clock installation

Known variations

Verge-and-foliot turret clocks (earliest surviving type)
Gravity-escapement (e.g. Denny/Grimthorpe-type) turret clocks
Electrically wound or synchronised turret clocks

Collecting notes

Turret clocks are collected and preserved largely in situ or by horological museums and preservation trusts rather than in private hands, owing to their scale; documentation of the responsible ironworks or clockmaking firm is central to their historical value.