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TELEMETER
(for models with telemeter scale on the dial)
The telemeter can provide a rough indication of the distance to the source of light
and sound.
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.
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.
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.
To measure the hourly rate of operation
Use the stopwatch to measure
the time required to complete 1
job.
1
Tachymeter scale indicated by
the stopwatch second hand gives
the average number of jobs ac-
complished per hour.
2
Ex. 1
STOPWATCH
second hand:
20 seconds
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
8


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