Re: gEDA-user: pcb, how to remove mm garbage (very short lines)?

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

Interesting.

OK I think for PCB purposes 1 inch is exactly 2.54 cm by definition.

"1959 the national standards laboratories of the English-speaking
nations agreed to standardize the relation between the yard and the
meter"


For geodetic data here in the US the traditional value of 1 yard =
3600/3937 meter or 1 yard = 0.914 401 8288 meter

Which works out to be  1 in =  0.025400051 m


Steve Meier


http://www.wsdot.wa.gov/Reference/metrics/foottometer.htm


On Wed, 2008-11-19 at 19:45 -0700, John Doty wrote:
> On Nov 19, 2008, at 7:21 PM, Steve Meier wrote:
> 
> > 1 in = 25.399999999972 mm not exactly 25.4 but close enough for layout
> > work if you use high enough precision.
> 
> Where'd you get that? I have multiple references that say it's 25.4  
> *exactly*. To even be able to measure distances of order 1 inch at  
> the level of precision implied by your statement may be impossible.  
> You're talking subatomic dimensions here...
> 
> John Doty              Noqsi Aerospace, Ltd.
> http://www.noqsi.com/
> jpd@xxxxxxxxx
> 
> 
> 
> 
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