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Article #2583Re: Port Holes
From: John Schiermeier
Date: Thu, 07 Jan 1993 20:37
Date: Thu, 07 Jan 1993 20:37
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In article <C0HJKt.7vo@watdragon.uwaterloo.ca> deghare@daisy.uwaterloo.ca (Dave Hare) writes: >In article <13797@grayt> grayt@Software.Mitel.COM (Tom Gray) writes: >> >>Man hole covers are round because man holes are round. >> >>The puzzle is: >>Why are manholes round? >> >>A more serious problem is: >>Why are ship port holes round? > >And an even more serious question is: Why are airplane windows (roughly) >round? The corners of the windows have been rounded to decrease the likelihood of cracks as the plane goes through pressurization cycles. This is the same principle as fillets in machine parts. One of the earlier passenger planes, the British Comet, had windows with corners. Several of them crashed due to cracking. (This is an example undergrad engineering professors love to cite in design classes.) John
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<1993Jan7.203701.21091@draco.macsch.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!jvnc.net!newsserver.jvnc.net!darwin.sura.net!sgiblab!adagio.panasonic.com!nntp-server.caltech.edu!draco.macsch.com!downey.dev.macsch.com!jesReferences:
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Newsgroups: rec.puzzles Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!jvnc.net!newsserver.jvnc.net!darwin.sura.net!sgiblab!adagio.panasonic.com!nntp-server.caltech.edu!draco.macsch.com!downey.dev.macsch.com!jes From: jes@downey.dev.macsch.com (John Schiermeier) Subject: Re: Port Holes Message-ID: <1993Jan7.203701.21091@draco.macsch.com> Sender: usenet@draco.macsch.com (Usenet Poster) Organization: The MacNeal-Schwendler Corporation References: <13797@grayt> <C0HJKt.7vo@watdragon.uwaterloo.ca> Date: Thu, 7 Jan 93 20:37:01 GMT Lines: 24