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- Newsgroups: comp.std.internat
- Path: sparky!uunet!pipex!pavo.csi.cam.ac.uk!ag129
- From: ag129@cus.cam.ac.uk (Alasdair Grant)
- Subject: Re: ISO paper sizes
- Message-ID: <1993Jan4.170125.3951@infodev.cam.ac.uk>
- Sender: news@infodev.cam.ac.uk (USENET news)
- Nntp-Posting-Host: bootes.cus.cam.ac.uk
- Organization: U of Cambridge, England
- References: <1i9j4gEINN8nd@uni-erlangen.de>
- Date: Mon, 4 Jan 1993 17:01:25 GMT
- Lines: 22
-
- In article <1i9j4gEINN8nd@uni-erlangen.de> mskuhn@immd4.informatik.uni-erlangen.de writes:
- >Here for the aprox. 5% of the world population that don't use ISO paper sizes
- >the dimensions of 3 of the most popular sizes:
- >
- > A4 210 x 297 mm
- > C5 162 x 229 mm (envelope for A4 folded to A6 format)
- > DL 110 x 220 mm (envelope for A4 folded twice parallel)
- >
- >1 inch is 25.4000000 mm.
-
- 1 SI inch is 2.54mm _exactly_, not just to 7 decimal places.
- But the people who don't use ISO paper sizes don't use SI inches
- either, they use NIST inches, which differ from SI inches well before
- the 8th decimal place. (I don't know the exact details - after all,
- why should I know about American internal standards?)
-
- I believe NIST inches are a standard unit in HyTime.
-
- Does the persistence of the NIST inch have anything to do with the
- US public's huge stock of old guns needing new ammo machined to low
- tolerances? Britain had no problems redefining its Imperial measures
- as SI multiples... I wonder.
-