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To measure the hourly rate of operation
Use the stopwatch to
measure the time required to
complete 1 job.
Tachymeter scale indicated
by STOPWATCH second
hand gives the average
number of jobs accomplished
per hour.
STOPWATCH
second hand:
20 seconds
Tachymeter scale: “180”
“180” (tachymeter scale figure) x 1 job
= 180 jobs/hour
Ex. 1
1
2
Ex. 2: If 15 jobs are completed in 20 seconds:
“180” (tachymeter scale figure) x 15 jobs = 2700 jobs/hour