Breitling BENTLEY SUPERSPORTS Manual Del Usario página 17

The variable tachometer is composed of a fixed scale (a) and a mobile scale or
disc (b). The fixed scale is read off clockwise, and the mobile disc in the oppo-
site direction. The graduations between two numbers represent tenths of units.
To read off a result, the decimal point must be placed correctly. For example,
the figure 3.2 may represent 0.32, 3.2, 32, 320, etc. The fixed scale comprises
three reference marks:
SECONDS (1) on the figure 3.6 (one hour equals 3,600 seconds);
G
MINUTES (2) on the figure 6 (one hour equals 60 minutes);
G
HOURS (3) on the figure 1 (one hour is the base unit for all calculations).
G
2
1 3
a
(a) Fixed scale
(b) Mobile scale (disc)
b
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2.1 Mode of operation
lways place the distance covered opposite the reference mark serving as the
basis for the calculation:
on SE ONDS if the interval is measured in seconds;
G
on MINUTES if the interval is measured in minutes;
G
on HOURS if the interval is measured in hours.
G
N.B. The time measured using the chronograph must be converted if necessary
into seconds, minutes or hours to correspond to one of the three reference
marks on the fixed scale. For example: 1 minute 20 seconds = 80 seconds; 1 hour
10 minutes = 70 minutes, etc.
Example 1: if a vehicle covers 1.5 km (or 1.5 miles) in 45
seconds, what is its average speed?
Solution: place the figure 1.5 (distance covered) on the
SECONDS mark of the fixed scale, then read off the result
opposite the figure 45 (interval measured); in this case
120 km/h (or 120 mph).
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