English
To measure the hourly rate of operation
1Use the stopwatch to measure the time required to complete 1 job.
2Tachymeter scale indicated by STOPWATCH second hand gives the average number of jobs ac- complished per hour.
Ex. 1
| 5 | STOPWATCH |
| 30 |
|
25 |
| second hand: |
20 | 10 | |
| 20 seconds | |
| MIN. |
Tachymeter scale: “180”
“180” (tachymeter scale figure) x 1 job = 180 jobs/hour
Ex. 2: If 15 jobs are completed in 20 seconds:
“180” (tachymeter scale figure) x 15 jobs = 2700 jobs/hour
14