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SPECIAL CHARACTERISTICS
USING THE TACHOMETER
The tachometer is the graduation on the dial or flange of your B
REITLING
chronograph enabling you to determine average speeds or hourly produc-
tivity rate, based on an observation period of less than 60 seconds.
1. Average or mean speed
Using the chronograph to measure the time required to cover a kilometre or
a mile. If it takes 20 seconds to cover 1 km or 1 mile, the scale respectively
indicates an average speed of 180 km/h or 180 miles/h.
2. Hourly productivity rate
Measuring the time required to produce 1 unit. If the chronograph is stopped
at 40 seconds, the tachometric scale indicates 90, corresponding to an hourly
productivity rate of 90 units.
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