English
14
1 Use the stopwatch to determine how
many seconds it takes to go 1 km or
1 mile.
2 Tachymeter scale indicated by
STOPWATCH second hand gives
the average speed per hour.
TACHYMETER
[for models with tachymeter scale on the dial]
STOPWATCH
second hand:
40 seconds
To measure the hourly average speed of a vehicle
[ Ex. 1 ]
▲
Tachymeter
scale: “90”
“90” (tachymeter scale figure) x
1 (km or mile) = 90 km/h or mph
Tachymeter scale can be used only when the time required is less than 60 seconds.
Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to
0.5 km or miles and STOPWATCH second hand indicates “90” on
tachymeter scale:
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