Other Functions; Rotating Diving Bezel; Measurement Scales - Alpina AL-235 Garantía E Instrucciones

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other functions

OTHER
FUN
CTIONS
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3.1
ROTATING
DIVING
BEZEL
An essential feature of all Alpina diving watches
is the unidirectional, anti-clockwise, rotating be-
zel, used to control immersion time. The bezel is
fitted with a graduated scale divided into minutes.
The bezel's working principle is both simple and
reliable. At the beginning of each immersion, the
zero on the bezel must be aligned with the minute
hand. A simple glance at the position of the mi-
nute hand with respect to the bezel will show the
diver at any moment how much time has elapsed
since the start of the dive (in minutes).
The unidirectional anti-clockwise rotation of the
bezel is a safety feature that ensures that any ac-
cidental movement of the ring will always cause
the remaining diving time to reduce with respect
to the effective remaining diving time.
3.2
MEASUREMENT
SCALES
Measurement scales are scales that establish a
relation between elapsed time and another va-
riable. The desired information in terms of speed
(tachymeter), distance (telemeter) or units (pul-
someter, productivity meters) is read off between
the central seconds hand of the chronograph
and the corresponding scale, over a maximum
duration of 60 seconds. For the telemeter, it is
possible to make use of the minutes counter by
adding 20 km to the distance indicated by the
central seconds hand for each minute elapsed.
TACHYMETER SCALE USE
Example 1: calculating the speed of a car.
Measure the time it takes the car to cover a distance
of 1 km. Read off the speed indicated by the central
chronograph seconds hand on the tachymetric scale.
In our example, the car is travelling at 90 km/h.
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