[AT] OT pocket knives

[rlgoss at twc.com]

Oh yes -- Graphical Calculus.  I may not have had the same problem, but I experienced the same exercise.  When I was a freshman at Purdue, all four members of BALT publishing were teaching there.  Warren Luzadder was the first professor I had for a class.  When I started teaching there in 1963, Merle Bolds, Norm Arnold, and Warren Luzadder were still on the faculty. Frank Thompson left for a few years and then rejoined the department after retiring from LTV.  Merle Bolds got me into singing with SPEBQSA. Norm was often seen carrying double-size masters around the department as he prepared new manuals.  Warren and I became co-authors of textbooks and workbooks (along with Ken Botkin) and I spent many hours with Frank Thompson trying to absorb as much of his practical expertise as I could.  Those were memorable days, Charlie -- really!



Larry
---- charlie hill <charliehill at embarqmail.com> wrote: 
> I'll see if I can find it.  I was trying to remember from almost 50
> years ago something we were taught in Engineering Graphics.
> I can't remember the details but there was a curve (sine curve or whatever)
> drawn above the line on a drawing sheet and somehow using drafting 
> instruments
> we transferred measurements from the curve to the area below the line
> forming another shape (maybe a straight line?) that represented the 1st 
> derivative of
> the curve.   Does that sound at all right?   I just can't remember the 
> details.  I remember
> at the time being somewhat amazed at the process because of it's simplicity 
> and result.
> 
> Charlie
> 
> 
> -----Original Message----- 
> From: rlgoss at twc.com
> Sent: Tuesday, July 14, 2015 6:33 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] OT pocket knives
> 
> BINGO! I found an article on-line about this planimeter, folks.  It even has 
> a
> name -- Prytz or Hatchet planimeter.  for a good discussion (complete with
> illustrations, formulas, etc.) search for make-shift planimeter, and go to 
> the
> PDF written by professors from Wabash and Western Connecticut --Area Without
> Integration: Make Your Own Planimeter.  After reading this article, I 
> remember
> having made one of these out of a straightened clothes hanger.
> 
> 
> Larry
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