semi-instantaneous is not the same as instantaneous

Hi Guys,

Lange's minute counter is instantaneous. Precisely at the 60 second mark, the minute hand jumps instantly to the next minute.

Most minute counters are semi-instantaneous. A few seconds before the minute changeover they start to creep a little and then they snap over at the 60 second mark. This is how the minute counter in the new JLC chronograph works and also how the Vj 72 and Omega 321 work.

_john