Chronograph
A watch equipped with a separate measuring mechanism and a separate seconds hand (chrono hand) that allows the measurement of short time intervals (stopped times).
Column wheel
Also: ratchet wheel, sometimes pillar wheel. A steel switching wheel that has upright columns. It controls all important switching operations in a chronograph mechanism.
Flyback
This complicated mechanism in the movement of the DATOGRAPH allows the user to instantly set the chronograph seconds hand to zero during an ongoing measurement. When the push-piece is released again, a new measurement starts without delay. This transforms the conventional sequence of "stop", "set to zero", and "start" steps into one single step.
Precisely jumping minute counter
This is a function in Lange's chronographs that makes it easy to read stopped times. During a measurement, the minute counter does not advance gradually but instead jumps to the next minute marker when precisely 60 seconds have elapsed.
Outsize date display
Depending on the size of the watch, this useful function makes it possible to display the date up to five times larger than in a conventional watch of similar dimensions. It is based on the patented two-disc mechanism.
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With this technical masterpiece "Made in Germany", Lange created a new benchmark in the construction of exquisite mechanical watches: The DATOGRAPH is the world's first | chronograph based on the classic | column-wheel principle with | flyback, precisely jumping | minute counter, and patented | outsize date.

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