Jumping second
The term jumping second (also: tote second , French seconde morte ) is used when the second hand of a watch moves by one jump every second and then remains stationary until the next second jump.
The opposite of this is the creeping second (French: Seconde trotteuse ). The second hand moves continuously and reaches a new second mark every second.
Jean-Moïse Pouzait (1743–1793) first developed a mechanism for driving the second hand that was independent of the movement and that could be stopped separately in 1777 .
In mechanical quartz watches , the jumping second is caused by the electrical drive system such as the Lavet stepper motor .
See also
Individual evidence
- ↑ Fritz von Osterhausen: Callweys lexicon. Callwey, Munich 1999, ISBN 3-7667-1353-1 .