Sprungzeiger

Sprungzeiger is a term originating from German horology, translating literally to "jump pointer" or "jumping hand." It refers to a specific type of mechanism found in clocks and watches, particularly in leap second displays and some time zone indicators. Unlike traditional hands that move continuously or in small increments, a sprungzeiger hand advances in discrete, noticeable jumps. This can be achieved through various mechanical means, often involving a cam or a spring-loaded lever system that releases the hand at predetermined intervals.

The primary function of a sprungzeiger is to indicate a specific point in time that requires a sudden change or update. In the context of leap seconds, a sprungzeiger might be used to visually represent the addition of an extra second, moving from 23:59:59 to 23:59:60 before proceeding to 00:00:00. This offers a clear and immediate visual cue of the temporal adjustment. Similarly, some watches designed to display multiple time zones might employ a sprungzeiger to shift between different zones, allowing for a distinct movement rather than a gradual sweep. While not as common as standard hour, minute, or second hands, the sprungzeiger serves a niche but important role in specialized timekeeping devices, enhancing the precision and clarity of certain temporal information.