second hand indicates “180” on the
tachymeter scale. This means that 180
jobs will be completed in one hour.
180 (Tachymeter scale figure x 1 job =
180 jobs at 20 second position)
Ex. 2
Use the stopwatch to determine how
many jobs are completed in a specific
period of time.
If 15 jobs are completed in 20 sec-
onds, multiply “180”, the figure on the
tachymeter scale indicated by the
stopwatch second hand, by 15. Thus,
it is estimated that 2,700 jobs will be
completed in one hour.
180 (Tachymeter scale figure x 15
jobs = 2,700 jobs per hour at 20 sec-
ond position)
22
HOW TO USE THE TACHYMETER
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