Ball NM2038 Mode D'emploi page 14

Tachymeter: It computes speed over a given distance.
MODELS: CM1010, CM1092, CM2092, CM2192, CM3888
The wearer can find the correct speed
per hour by recording the time needed
to travel a certain distance.
Description of operation
Please refer to the above instructions for
"Automatic Chronograph" to reset the chronograph counter to zero position.
To compute the speed of a vehicule over a certain distance, press the top
chronograph button [P1] to start timing. At the end of the fixed distance,
press the button again. If the time elapsed is 45 seconds, the second hand
should point to the figure 80 on the Tachymeter scale. If the fixed distance
is one kilometer then the car is traveling 80 kilometers per hour.
The Fireman Skylab (CM1092), Fireman Storm Chaser (CM2092) and
Fireman Storm Chaser DLC (CM2192) have a tachymeter scale on the
outer bezel for measurement of elapsed times up to 1 minute.
The inner spiral of the Trainmaster Pulsemeter (CM1010) is a tachymeter
scale capable of measuring elapsed time of up to 3 minutes. If for example,
the time elapsed is 1 minute 30 seconds, the second hand will point to the
figure 40 on the 2nd ring of the Tachymeter scale. Over a distance of 1 mile,
the car is thus traveling at 40 miles per hour.
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Telemeter: It measures the distance between the observer and a situation
that is both visually and audibly observable.
MODELS: CM1020, CM2092,
CM2192, CM3090
The telemeter scale is based on
the speed of sound through air,
approximately 340 meters per
second. Originally, it has been used
to measure the distance to lightning
or the distance to artillery fire.
Description of operation
Please refer to the above instructions for "Automatic Chronograph" to reset
the chronograph counter to zero position.
The Engineer Master II Telemeter (CM1020), Fireman Storm Chaser
(CM2092), Fireman Storm Chaser DLC (CM2192) and Fireman Storm
Chaser Pro (CM3090) can measure time accumulated up to 30 minutes with
the minute counter beneath the 12 o'clock position. The push- buttons [P1]
and [P2] are screw-in type; they have to be unscrewed in order to function.
Start the chronograph by pressing push-button [P1] on the optical signal
(e.g. a flash of lightning) and then stop the counter when the audio signal
(e.g. thunder) is heard. The distance will be indicated on the telemetric scale
in kilometers, pointed by the position of the chronograph second hand.
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