Longines L55124715 User Manual

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CHRONOGRAPHS – GENERAL POINTS

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 scienti c

experiments, for example.

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  rst stage, press push-pieceA to start

the chronograph.

• At the end of the  rst 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  nal 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 ef ciency its handling provides. In particular, the

instant responsiveness of its pushpieces adds to the pleasure of

using the chronograph.

Tachometric scale

Chronograph  tted 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 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).

Pulsometer scale

A chronograph whose dial features a scale enabling the

wearer to directly read their hear trate, by starting the

chronograph and counting 30 beats.

IMPORTANT! The time should not be adjusted

while the chronograph function is being used.