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- From: crowl@jade.CS.ORST.EDU (Lawrence Crowl)
- Newsgroups: comp.std.internat
- Subject: Re: ISO paper sizes
- Message-ID: <1idp0qINNa91@flop.ENGR.ORST.EDU>
- Date: 6 Jan 93 05:00:10 GMT
- References: <1i9j4gEINN8nd@uni-erlangen.de> <1993Jan4.170125.3951@infodev.cam.ac.uk>
- Organization: Computer Science Department, Oregon State University
- Lines: 23
- NNTP-Posting-Host: jade.cs.orst.edu
-
- In article <1993Jan4.170125.3951@infodev.cam.ac.uk>
- ag129@cus.cam.ac.uk (Alasdair Grant) writes:
- >1 SI inch is [25.4 mm] _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?)
-
- The official and legal measure system for the United States is, and has
- been since the 19th century, the metric system. (Little known fact, I
- forget exactly where I read it.) The US "imperial" system was defined
- in terms of the metric system. In this definition, 39.37 inches are
- defined to be exactly 1 meter (metre). If you invert this, you get
- 25.400050800101603 mm to the inch.
-
- I do not know why the SI definition of an inch was changed from the
- long-standing US definition. I believe it was changed sometime around
- 1960.
-
- --
- Lawrence Crowl 503-737-2554 Computer Science Department
- crowl@cs.orst.edu Oregon State University
- ...!hplabs!hp-pcd!orstcs!crowl Corvallis, Oregon, 97331-3202
-