Seiko SSC929 Owner Manual - Page 17

Telemeter

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English TELEMETER (for models with telemeter scale on the dial) 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 graduated so 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. 32 HOW TO USE THE TELEMETER Before beginning, check that the stopwatch has been reset. START (Flash of light) 1 Press Button A to start the stopwatch as soon as you see light. STOP (Crash of thunder) 2 When you hear the sound, press Button A to stop the stopwatch. 3 Read the telemeter scale that the STOPWATCH 1/5second hand points to. Approx. 3 km Please note that the STOPWATCH 1/5-second hand moves in 1/5-second increments and does not always point exactly to the graduations of the telemeter scale. The telemeter scale can be used only when the measured time is less than 60 seconds. 33 English

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English
English
32
33
TELEMETER
(for models with telemeter scale on the dial)
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 graduated so that the sound travels at a speed of 1 km in
3 seconds.*
*Under the condition of temperature of 20
°
C(68
°
F)
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.
CAUTION
HOW TO USE THE TELEMETER
Before beginning, check that the stopwatch has been reset.
START
(Flash of light)
STOP
(Crash of thunder)
Press Button A to start the
stopwatch as soon as you
see light.
When you hear the sound,
press Button A to stop the
stopwatch.
Read the telemeter scale
that the STOPWATCH 1/5-
second hand points to.
Approx. 3 km
Please note that the STOPWATCH 1/5-second hand moves in 1/5-second increments and does not
always point exactly to the graduations of the telemeter scale. The telemeter scale can be used
only when the measured time is less than 60 seconds.
3
2
1