6 Mar
2013
6 Mar
'13
10:06 p.m.
I use this method to determine the lengthof a clock spring in a barrel. One can even
estimatethe part that is unwound at the center as the coils areclose to evenly spaced. Two
calculation and I knowthe length.Dwight
Date: Wed, 6 Mar 2013 12:19:08 -0800
From: cisin at xenosoft.com
To: cctalk at classiccmp.org
Subject: Re: Slide Rules
On Wed, 6 Mar 2013, Fred Cisin wrote:
If flat spiral, we can estimate the length by PI
times the
arithmetic mean of the diameter (add the innermost, outermost,
and appropriate intermediates and divide by number of turns)
ERROR! (in my logorrheic babbling)
That should be PI times the arithmetic mean of the diameter times the
number of turns.
(PI * number of turns times ((innermost+outermost diameters)/2))
(or PI * number of turns times (innermost RADIUS + outermost RADIUS))
Would attempting to look up the answer in Wikipedia increase or
decrease the number of errors? Would it strengthen the strange
belief that "doing the math" is "TOO HARD"?
Optional Edison method: wrap a string following the scale and then
measure the string. (Apple's ad saying that "Edison could have
simulated, instead of trying different filaments", was antithetical
to the man's philosophy and style)