Date: Tue, 20 May 2008 02:46:17 +0000 From: Rick Nekus <solarux@hotmail.com> To: <freebsd-chat@freebsd.org> Subject: RE: slide rules Message-ID: <BAY113-W27BA01C8537489EEA56B59A1C40@phx.gbl> In-Reply-To: <20080519035209.GT46655@dereel.lemis.com> References: <37f72b1f0805181418j16efd60fge243160dbfdc6789@mail.gmail.com> <20080519035209.GT46655@dereel.lemis.com>
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My Uncle , a long-retired Consttruction Engineer used a "slide-rule" to est= imate the quantity/mixture/plasiciity/... of ALL the concrete needed for the building of the John Hancock building in= Chicago with nothing but a "Slide-Rule". ! -NO, I kid you not. His results? -its still standing. -"NO" computers neede= d. Of course he had a few decades of experience with concrete prior. =20 yup, and he still likes to remind me of that fact, and ya, I do have some l= inks now to prove it. :) -whatever can work. > Date: Mon, 19 May 2008 13:52:09 +1000> From: grog@FreeBSD.org> To: saltmi= ser@gmail.com> CC: freebsd-chat@freebsd.org> Subject: Re: slide rules> > On= Sunday, 18 May 2008 at 17:18:30 -0400, Jim Capozzoli wrote:> > So, I pulle= d out the slide rule yesterday that's older then I am..and> > I figured out= how to multiply/divide on it. Is there anybody out> > there still using sl= ide rules for day to day math? Or does anybody> > have any interesting stor= ies/reminiscences about slide rules? I was> > considering figuring out how = to do Trig on it and then taking my Trig> > final with it. :)> > Heh. I don= 't know where my slide rule is, but it's definitely a lot> younger than I a= m. So the following is from memory. It applies to> the conventional slide r= ules that I know, with C/D scales going from 1> to 10 at the bottom, and A/= B scales going from 1 to 100 at the top> (giving squares of the correspondi= ng scale below).> > To multiply two numbers, you place the 1 on the C scale= (bottom of the> slide) against the first number on the D scale (directly b= elow on the> body). Move the cursor (or your eye :-) to the second number o= n the C> scale, and read off the result on the D scale.> > To divide one nu= mber by another, you place the divisor the C scale> above the dividend on t= he D scale. Read off the quotient on the D> scale below the 1 on the C scal= e.> > Greg> --> See complete headers for address and phone numbers. _________________________________________________________________
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