[AT] OT pocket knives

[charlie hill]

Ok,  that's starting to make sense.   I haven't worked through the math and
probably won't since I've forgotten so much but I see how the "device" 
travels
now.  It's actually similar to what would happen with one rear wheel (say 
the left)
of a farm wagon if you attempted to trace out a pattern with the left front 
wheel of
the wagon.  Here's the link to the article you mentioned

http://persweb.wabash.edu/facstaff/footer/Papers/Foote.Sandifer.Reprint.pdf

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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