Pocket watches · Complication

Repeater Pocket Watches

Partially verified

Watches that sound the time on demand, striking hours and subdivisions on a bell or gongs when a slide or pusher is operated.

Mechanism

Operating the slide winds a dedicated striking train; a snail cam read by a rack determines how many hour blows are released, with a quarter or minute rack governing subdivisions.

Typical characteristics

Case slide or plunger charging the striking train
Racks, snails and hammers occupying much of the movement space
Audible through pierced case backs on earlier examples, or gongs on later ones

Construction and interpretation

Repeating work sounds the time on demand. It differs from a sonnerie, which can strike automatically at intervals, although a complicated watch may combine both functions. A slide or plunger supplies or releases energy to the repeating mechanism; racks reading stepped snails determine the number of blows. The case actuator and sound are observable evidence, but a visible slide alone does not prove that a complete or working repeater survives inside.

The subdivision being sounded is central to the description. A quarter repeater gives hours and completed quarters; a five-minute repeater counts five-minute intervals; a minute repeater adds the minutes since the last quarter. Bell and gong constructions, tone conventions and regulator designs vary. Record the actual sequence only when the watch can be operated safely under competent supervision, and distinguish a documented mechanism from a seller's generic use of the word repeater.

Repeater type	Time subdivisions	Example at 2:49
Quarter	Hours and completed quarters	2 hours; 3 quarters
Five-minute	Hours and five-minute intervals	2 hours; 9 five-minute intervals
Minute	Hours, quarters and remaining minutes	2 hours; 3 quarters; 4 minutes
Sonnerie	Automatic striking at intervals	Not defined solely by on-demand repetition