I think that mil is short for milli inch, which is really mixing  
systems.
I think that power folks do even worse.  Wires larger than 4/0 are  
given in circular mils, or cm.  When I started with a power company 42  
years ago, one thousand circular mils was MCM, where the M was from  
Roman Numerals for thousand.  That was confusing, as it could also  
refer to Mega, so the M was changed to K for Kilo, so we had Kcmils.

73,
Rick  K7MW  (not megawatts)


On Jan 2, 2012, at 9:20 PM, Don Wilhelm wrote:

> Unfortunately, one has to be cautious of common "technical slang" in  
> an
> international community.  Yes, common in US machinist's talk is for a
> 'mil' to equal 0.001 inch.  I am not certain of the origin and even
> though I looked it up at Wikipedia, I still don't have any answer to  
> why
> 'thou' is equal to 'mil' (even though I use and understand that unit
> myself).
>
> 73,
> Don W3FPR

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