English
12
60
TACHYM
ETER
50
0
40
0
30
0
2
5
0
2
0
0
18
0
16
0
140
12
0
10
0
90
8
0
75
70
6
5
To measure the hourly rate of operation
U s e t h e s t o p w a t c h t o
measure the time required to
complete 1 job.
Tachymeter scale indicated
b y S T O P W A T C H s e c o n d
h a n d g i v e s t h e a v e r a g e
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
