[AT] OT pocket knives

[rlgoss at twc.com]

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