How do I use the tachymeter on Speedmaster watches?
A tachymeter is an instrument for measuring speed. It is a chronograph with a graduated dial on which speed can be read off in kilometres per hour based on 1000 metres distance. How to read an observation on the tachymeter: Only the central chronograph seconds-hand is used. For observations of a longer duration, the indications of the timers (minutes and hours) count. Example for calculating the speed of a car:The chronograph indicates that the distance of one kilometre has been covered in 30 seconds. The corresponding point on the tachymeter scale indicates 120. The speed is therefore 120 km per hour.
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