The largest independent, non-commercial, consumer-oriented resource on the Internet for owners, collectors and enthusiasts of fine wristwatches. Online since 1998.
Informational Websites ChronoMaddox -- the legacy of Chuck Maddox OnTheDash -- vintage Heuer website Zowie -- Omega information
Discussion Forums ChronoMaddox Forum Heuer Forum Omega Forum
Counterfeit Watchers ChronoTools Forum ChronoTrader Forum
Vintage Heuer Discussion Forum
The place for discussing 1930-1985 Heuer wristwatches, chronographs and dash-mounted timepieces. Online since May 2003.
OnTheDash Home What's New! Price Guide Chronographs Dash Mounted Collection
Omega's have them too, here's an explanation...
In Response To: explain Tachymeter function ()

: What is the tachymeter function on the outer
: dials on some heuers. What do they measure
: and how do they measure?

Omega's have them too, here's an explanation from a 1957 Omega Catalog:

But to answer your specific queries:

What do they measure

As simply put as possible: Unit's per hour based on measurement of 1 interval that takes from 6-60 seconds.

and how do they measure?

A scale is created by dividing by 3600 by the number of seconds... So 3600 / 60 = 60, 3600 / 45 = 80, 3600 / 30 = 120 for example, and placed it on the watch. Then one can figure an average hourly rate by timing one increment (be it one mile traveled, one Kilometre, or one envelope stuffed) and reading it off the Tachymetre scale...

Your next question... Why 3600? 60 seconds in a minute, 60 minutes in an hour... 60 x 60 = 3600 ...

Pretty easy if you think about it, pretty clever too!

-- Chuck

Messages In This Thread

explain Tachymeter function
Re: explain Tachymeter function *NM*
Omega's have them too, here's an explanation...
Current Position
Chronocentric and zOwie site design and contents (c) Copyright 1998-2005, Derek Ziglar; Copyright 2005-2008, Jeffrey M. Stein. All rights reserved. Use of this web site constitutes acceptance of the terms of use. CONTACT | TERMS OF USE | TRANSLATE