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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: How does the Tachymetre work?
In Response To: How does the Tachymetre work? ()

: I bought a Speedmaster Automatic, but I don't
: have the slightest clue of how the
: Tachymetre works . Help me out everybody.

The tachymeter is simply a scale that converts a number of seconds to a per-hour rate. It does this by dividing the number of seconds (60 or under) into the number 3600 (the number of second in an hour). So it works like a slide ruler to allow you to read the answer directly instead of having to do the division yourself.

The link that Keith gave explains the use of it well.

Other types of calculation bezels use the same principle, but based on different numbers to achieve other instant calculations.

A Decimal bezel divides a minute or hour into 1/100ths for statistical calculations. A telemeter bezel calculates speeds and distances at the speed of sound. And a pulsometer converts the time of 15 pulses into a conventional hart rate measure.

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