Longines DolceVita - Manual (Page 34)

THE CHRONOGRAPH
The chronograph is an instrument for measuring short
periods of time. It is used mainly in sport but also in
aviation or for scientific experiments, for example.
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IMPORTANT! The time should not be adjusted
while the chronograph function is being used.
Chronographs standard functions
Standard Start-Stop function
Add Rally function (partial times)
Standard Start-Stop function
Used for timing a single event:
Press push-piece A : to start the chronograph.
Press push-piece A : to stop the chronograph.
Press push-piece B to return to zero.
Add Rally function (partial times)
Used for measuring successive events but not the inter-
vals between them. Each result is automatically added
to the preceding one. To time the different stages of a
car rally, for example:
At the start of the first stage, press push-piece A to
start the chronograph.
At the end of the first stage, press push-piece A again
and the chronograph will stop.
Repeat this procedure for each stage of the rally.
At the end of the final stage the chronograph will show
the total time of the rally, in other words, the accumu-
lated time for all the stages.
Press push-piece B to return to zero.
The 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.
Tachometric scale
Chronograph fitted with a scale allowing speed
to be read in kph.
Measure the time needed to cover 1 kilometre (or 1 mile).
The position of the seconds hand when it stops indi-
cates 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).
Telemetric scale
Chronograph whose dial is fitted with a tele-
metric scale allowing the distance separating an event
from the place of observation to be known through the
speed of sound.
Chronographs – General Points