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English
English
Using the Tachymeterscale
General information
second hand
chronograph
The tachymeter is the device which measures the
speed of an automobile. Knowing in how many
seconds the car covers a distance of 1 km, the meter
can measure the approximate average speed per
hour during a journey (up to the maximum mea-
surable range of : 60 seconds.) If the chronograph
is started at the same time as measurement, and
stopped after 1 km, the average speed per hour
can be determined according to the position of the
second hand. If the car covers the distance of 1 km
in 45 seconds, the average hourly speed during the
journey will be about 80 km.
