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