The desired information (tachometer; pulsimeter) is read off between
the central seconds hand of the chronograph and the correspond
-
ing scale, over a maximum duration of 60 seconds. For the telemeter,
it is possible to make use of the minutes counter by adding 20 km
to the distance indicated by the central seconds hand for each
minute elapsed.
Using the tachymetric scale
Example: calculating the speed of a car.
Record the time the car takes to cover
a distance of 1 kilometre. Read off the
tachymetric scale the speed indicated by
the central seconds hand. In this case,
the car is travelling at 120 km/h.
Using the pulsimetric scale
Example: calculating the number of
heart-beats per minute.
Start the chronograph, count the heart-
beats and stop it at the beat correspon-
ding to the scale graduations of your
chronograph (here to the 30
th
beat).
Read the number of beats per minute
off the pulsimetric scale: here, 60 beats/
minute.
Measurement scales
Specific sections/general information3
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