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Chronographs – General information
CHRONOGRAPHS – GENERAL INFORMATION
The chronograph
The chronograph is an instrument for measuring short
periods of time. It is used mainly in sport but also in avi-
ation or for scientific experiments, for example.
Column Wheel
The column-wheel movement is reputed for the feeling
of crisp efficiency its handling provides. In particular, the
instant responsiveness of its pushpieces adds to the
pleasure of using the chronograph.
Split-seconds function
In a chronograph with a split-seconds function, a sec-
ond hand is superimposed over the trotteuse. When in-
termediate times are read off, only the split-seconds hand
stops. When the push-piece is pressed again, it catch-
es up with the trotteuse.
Tachometric scale
The tachometric scale is a series of graduations on the
dial or the bezel of the chronograph that enable the user
to determine mean speeds on the basis of an observation
time of less than 60 seconds.
Measure the time needed to cover 1 kilometre (or 1 mile).
The position of the seconds hand when it stops indicates
the mean speed. If it takes 30 seconds to cover 1 km
(or 1 mile), the scale will indicate a mean speed of
120 kph (or 120 mph).
IMPORTANT! The time should not be adjusted while the
chronograph function is being used.
Anglais ME Longines
9.4.2010
11:14
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