Re: [APD] Aquatic-Plants Digest, Vol 37, Issue 34

["S. Hieber" <shieber at yahoo_com>]

Or just use a rock to weight down you plants.

sh
 
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----- Original Message ----
From: James H <spreerider at gmail_com>
To: aquatic-plants at actwin_com
Sent: Thursday, September 28, 2006 5:42:19 PM
Subject: Re: [APD] Aquatic-Plants Digest, Vol 37, Issue 34


if you want the resistance of an object then the best way to get this is to
use a known constant for the given material (i cant remember the formula
right now) and convert the dimensions of the material to CMA (circular mil
area) this is 1/1000 of an inch measured circularly.  using this and the
known value its easy(if you know the formula which i seem to have forgot,
9months after learning it in my last term of training) to get an expected
resistanc, this is how wire is measured using a wheaton bridge and the AWG
of the wire converted into CMA.

if i had my books with me i could find it quickly but alass they are packed
in boxes in a corner of the basement. :(
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