If it takes 40 seconds to go one kilo-
meter (or one mile), the stopwatch
second hand indicates “90” on the
tachymeter scale. This means that the
average speed of the vehicle is 90
kilometers (or miles) per hour.
90 (Tachymeter scale figure x 1
(Kilometer or mile) = 90 km/h (mph)
at 40 second position)
Ex. 2
If the measuring distance is extended
to 2 kilometers (or miles) or short-
ened to 0.5 kilometers (miles), multi-
ply the figure on the tachimeter scale
by 2 or 0.5, respectively.
We recommend that you utilize the
tachymeter in a rally, speedway or cir-
cuit rase.
90 (Tachymeter scale figure x 2
(Kilometers or miles) = 180 km/h
(mph) at 40 second position)
90 (Tachymeter scale figure x 0.5
(Kilometers or miles) = 45 km/h
(mph) at 40 second position)
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HOW TO USE THE TACHYMETER
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