The Tachometer -scale

The Tachometer -scale serves to record average speed in miles (or km) per hour over a measured mile (or km). Start the sweep second hand when passing the starting line and stop when passing the finish line of the measured mile (or km). The sweep hand will now point on the Tachometer graduation to the average speed in miles (or km) per hour.

- 1963 Heuer chronograph brochure

 
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2nd execution. Valjoux 723.
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2nd execution. Valjoux 723.