Breitling BENTLEY 6.75 Manual De Instrucciones página 17

Division: division works in the opposite way to the pre-
vious example. to divide 54 by 2, one need only place the
figure 54 opposite the HOURS mark on the fixed scale or fi-
gure 1 on the mobile disc. the result is read off opposite fi-
gure 2 on one or other of the scales. this single operation
produces a complete division table of the figure 54:
54 : 2 = 27
54 : 3 = 18
54 : 18 = 3, etc.
Rule of three: both scales enable one to perform a multiplica-
tion and then a division in just one operation. For example,
to determine the price of 6 meters of cable, if 1.5 meters
costs £ 9, one places the number 9 opposite the figure 6. the
result is shown opposite the figure 1.5; in this case £ 36.
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Hourly production or consumption rate: measuring a produc-
tion rate or an hourly consumption rate follows the same
principle as the measurement of an average speed. For
example, if a machine produces 15 units in 45 seconds, what
is its hourly production?
Solution: place the figure 15 (the quantity produced) on the
SECONDS mark on the fixed scale, then read off the result
opposite figure 45 (interval measured); in this case 1,200 units
per hour.
Pulsometer: the pulsometer enables fast calculation of pulse
rate. For example, if 27 beats are measured over a 24-second
period, one need only place the figure 27 (number of heart-
beats) opposite the MINUTES marker, and then read off the
result opposite figure 24 (length of observation); in this
case 67 beats per minute.
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