A Telemeter is a scale used to measure the distance separating an observer from a phenomenon which is first visible and then audible. Its graduation is based on the speed of sound (343 m/s).
How do you use a telemeter scale?
In general, use a telemeter by following this process:
- Start the chronograph upon seeing an event.
- Stop the chronograph upon hearing the event.
- The telemeter value at which the second hand points approximates the distance between your position and the event, in the stated units of the telemeter.
How do you read a telemeter watch?
Here's how to use the telemeter.
- Start the stopwatch when the event is seen.
- Stop it when its sound is heard.
- The telemeter scale value at which the second hand is pointing is the approximate distance between your position and the event.
