TACHYMETRIC SCALES
The desired information is read between the central seconds hand of the
chronograph and the corresponding scale, over a maximum duration of 60
seconds.
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.
2 / 2
