Breitling BENTLEY 6.75 Manual De Instrucciones página 16

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).
Example 2: if a vehicle covers 4.5 km (or 4.5 miles) in
1 minute 30 seconds (= 90 seconds), what is its average speed?
Solution: place the figure 4.5 (distance covered) on the
SECONDS mark on the fixed scale, then read off the result
opposite the figure 90 (= 1 minute 30 seconds); in this case
180 km/h (or 180 mph).
Example 3: if a vehicle covers 50 km (or 50 miles) in 15 min-
utes, what is its average speed?
Solution: place the figure 50 (distance traveled) on the
MINUTES mark on the fixed scale, then read off the result
opposite the figure 15; in this case 200 km/h (or 200 mph).
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Example 4: if a vehicle covers 800 km (or 800 miles) in 5
hours, what is its average speed?
Solution: place the figure 800 (distance covered) on the
HOURS mark on the fixed scale, then read off the result op-
posite the figure 5; in this case 160 km/h (or 160 mph).
1.2 Other uses
Variable tachometric scales can be used for performing other calculations: multi-
plications, divisions, rules of three, hourly production rates, hourly consumption
or flow rates, heartbeats/minute (pulsometer), etc.
Multiplication: to multiply 3 x 18, place the figure 18 on the
fixed scale or the mobile scale opposite the figure 3. the
HOURS mark on the fixed scale and figure 1 on the mobile
disc both indicate the result, which is 54.
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