Wristwatch Tachymeter

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Old 11 November 2009   #1
Wristwatch Tachymeter

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.
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Old 11 November 2009   #2
Doesn't anybody know this? That tachymeter is all I have left to do .
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Old 11 November 2009   #3
Hope this helps.....

http://en.wikipedia.org/wiki/Tachymeter

And remember google is your friend!

Cheers!
 
Old 11 November 2009   #4
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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Old 11 November 2009   #5
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