LC #42 Pipers Alley

View Full Version : Wristwatch Tachymeter

11-11-2009, 01:08 PM
Not quite sure where this could be asked, but I'm stumped with that. I'm modelling a Breitling Navitimer Wold ( wristwatch, and it's easy enough... except that damn tachymeter.

Thing is, I don't know what rules make up the spacing between the increments for it - it's not like the seconds or minutes or hours, where the lines are set evenly. Now with the tachymeter, you have them way off - sometimes more increments, now less, then more again.

What I'm asking is if anyone knows a rule, or something like a formula how the increments are set.

11-16-2009, 03:37 PM
Doesn't anybody know this? That tachymeter is all I have left to do :) .

11-17-2009, 01:33 PM
Hope this helps.....

And remember google is your friend! :thumbsup:


11-21-2009, 11:21 AM
I must've been blind, because I did check that page long before, but didn't see anything of help.

To quote, "The spacings between the marks on the tachymeter dial are therefore proportional to 1/t where t is the elapsed time, or -log(t), and hence the tachymeter scale is sometimes also described as logarithmic.".

Ah well, time to brush up on math again -_- .

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11-21-2009, 11:21 AM
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