English

To measure the hourly rate of operation

Ex. 1

1 Use the stopwatch to measure the time required to complete 1 job.

2 Tachymeter scale indicated by STOPWATCH second hand gives the average number of jobs ac- complished per hour.

STOPWATCH second hand: 20 seconds

TELEMETER

(for models with telemeter scale on the dial)

English

● 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.

 

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

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● 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 ºC (68 ºF).

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.

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Seiko 7T82 manual Telemeter, To measure the hourly rate of operation