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Article #4774Re: How do you draw a straight line?
From: Robert Firth
Date: Tue, 06 Oct 1992 11:56
Date: Tue, 06 Oct 1992 11:56
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In article <1aqd0hINNsm1@hpsdlss3.sdd.hp.com> johno@sdd.hp.com (John Ongtooguk) writes: > I seem to recall that the Mormans used long trays of water when > laying out the pitch of their irrigation systems and that it was > remarkably accurate over a long distance. Yup. So did the Romans and Egyptians, and probably many more civilisations. This method has the advantage of working, since it recognises that the Earth is round and you want to survey a great circle, not a straight line. Over the length of an aqueduct, that matters!
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<1992Oct5.154211.21663@ecrc.de> <HAGERMAN.92Oct5161957@rx7.ece.cmu.edu> <1aqd0hINNsm1@hpsdlss3.sdd.hp.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!wupost!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!news.sei.cmu.edu!firth From: firth@sei.cmu.edu (Robert Firth) Newsgroups: sci.physics Subject: Re: How do you draw a straight line? Message-ID: <1992Oct6.115619.14373@sei.cmu.edu> Date: 6 Oct 92 11:56:19 GMT References: <1992Oct5.154211.21663@ecrc.de> <HAGERMAN.92Oct5161957@rx7.ece.cmu.edu> <1aqd0hINNsm1@hpsdlss3.sdd.hp.com> Organization: Software Engineering Institute Lines: 10