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English
To read the time, the position of the central seconds hand
is used. For observations over longer periods, the indica-
tions of the totalisers (hours and minutes) are also used.
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 speed on the tachymetric scale
indicated by the central seconds hand. In this case, the
car is travelling at 120 km/hr.
Tachymetric scale