Article View: sci.electronics
Article #19455Re: WHat are those holes for?
From: David Palmer
Date: Tue, 19 Jul 1988 16:03
Date: Tue, 19 Jul 1988 16:03
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In article <303@btree.uucp> rfarris@btree.UCSD.EDU (rick farris) writes: >:[Why do standard electrical plugs have holes in the metal prongs? Argument from authority: Cecil Adams (as reported in "_More straight Dope_") asked various people in the industry. It turns out that early sockets could not hold plugs firmly enough, and so the holes were to give the sockets something to grip on. >:That's a good question! Along the same line, why is the ground prong >:round instead of flat like the other two? To fit the round hole in the socket of course. There are no stupid questions, but if there were, that would be one of them. :-) >Yes, and why the heck are manholes round? So that the manhole cover cannot fall into the hole, as it could if they were square. David Palmer palmer@tybalt.caltech.edu ...rutgers!cit-vax!tybalt.caltech.edu!palmer "Flowers -- Just say NO!!" - Mighty Mouse
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!lll-lcc!ames!elroy!cit-vax!tybalt.caltech.edu!palmer From: palmer@tybalt.caltech.edu (David Palmer) Newsgroups: sci.electronics Subject: Re: WHat are those holes for? Message-ID: <7327@cit-vax.Caltech.Edu> Date: 19 Jul 88 16:03:49 GMT References: <10790@oberon.USC.EDU> <327@richp1.UUCP> <303@btree.uucp> Sender: news@cit-vax.Caltech.Edu Reply-To: palmer@tybalt.caltech.edu.UUCP (David Palmer) Organization: California Institute of Technology Lines: 23