[AT] OT pocket knives
Recentjester at aol.com
Recentjester at aol.com
Tue Jul 14 17:02:16 PDT 2015
just what I need to get my bearings (pun)
In a message dated 7/14/2015 6:23:16 P.M. Central Daylight Time,
charliehill at embarqmail.com writes:
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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