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/ > [EMAIL PROTECTED] > > > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user