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Strange numbers on wristwatch dial
July 14, 2010 10:04 AM   Subscribe

What are these little numbers around the rim of the face/dial on my watch? http://i.imgur.com/Jl5Rr.jpg

It starts with 60 at the top, then there's an arrow to the right, and then this sequence: 600, 500, 400, 330, 275, 240 (and it goes on from there). I'm curious as to what purpose these numbers serve.
posted by Ike_Arumba to Technology (5 answers total)
 
http://en.wikipedia.org/wiki/Chronograph
posted by StarmanDXE at 10:08 AM on July 14, 2010


I think tachymeter is a better answer.
posted by Perplexity at 10:11 AM on July 14, 2010


Opps! Posted that link before I checked the wiki to make sure it was right! >_<>
This is what you want... http://en.wikipedia.org/wiki/Tachymeter
posted by StarmanDXE at 10:11 AM on July 14, 2010


Thanks! Interstimg that it's included on this particular watch, which doesn't have a second hand
posted by Ike_Arumba at 10:25 AM on July 14, 2010


Yes it is a tachymeter, which is useful on a chronograph. To use it, you really need a chronograph second hand (which you can reset to zero, start, and stop with the press of a button).

On your watch it is just an affectation, as is the stamped fake-guilloche dial. Sorry.
posted by fritley at 10:46 AM on July 14, 2010


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