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To measure the hourly rate of operation
Use the stopwatch to measure
the time required to complete 1
job.
1
Tachymeter scale indicated by
STOPWATCH 1/5-secondhand
gives the average number of
jobs accomplished per hour.
2
Ex. 1
STOP-
WATCH
1/5-second
hand:
20 seconds
Tachymeter
s c a l e : “1 8 0
“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
TELEMETER
(for models with telemeter scale)
l The telemeter can provide a rough indication of the distance to the source of
light and sound.
l The telemeter indicates the distance from your location to an object that
emits both light and sound. For example, it can indicate the distance to the
place where lightning struck by measuring the time elapsed after you see a
flash of lightning until you hear the sound.
l A flash of lightning reaches you almost immediately while the sound travels
to you at a speed of 0.33 km/second. The distance to the source of the light
and sound can be calculated on the basis of this difference.
l The telemeter scale is so graduated that the sound travels at a speed of 1 km
in 3 seconds.*
*Under the condition of temperature of 20°C(68°F).
CAUTION
The telemeter provides only a rough indication of the distance to the
place where lightning struck, and therefore, the indication cannot
be used as the guideline to avoid the danger of lightning. It should
also be noted that the speed of the sound differs depending on the
temperature of the atmosphere where it travels.
10


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