# Re: inductance calculations (fwd)

```Original poster: List moderator <mod1@xxxxxxxxxx>

---------- Forwarded message ----------
Date: Tue, 22 May 2007 17:30:44 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: inductance calculations (fwd)

Hi Matt,

I have never read Hull's Guide to the CSN. If the guide is used as a
mental exercise without building, depending on the detail, users may or
may not have noticed. Had they built a coil using the particular error
in question, then they would have encountered a problem. Considering no
one has mentioned it before that I am aware, I assume no harm done.
Books are full of errors, even many of our text books. A
professor/teacher will often point out the error right away, but I like
it when they allow students to find it.

Take care,
Bart

Tesla list wrote:

>Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Tue, 22 May 2007 15:45:33 EDT
>From: Mddeming@xxxxxxx
>To: tesla@xxxxxxxxxx
>Subject: Re: inductance calculations (fwd)
>
>
>In a message dated 5/22/07 9:00:58 A.M. Eastern Daylight Time,
>tesla@xxxxxxxxxx writes:
>
>Date:  Mon, 21 May 2007 22:45:07 -0700
>From: Barton B. Anderson  <bartb@xxxxxxxxxxxxxxxx>
>To: Tesla list  <tesla@xxxxxxxxxx>
>Subject: Re: inductance calculations  (fwd)
>
>Hi Matt,
>
>For 1 meter using 1cm wire diameter, straight  wire inductance
>calculations show 1uH. Change the diameter to 0.1cm with  the same 1
>meter length and I calc'd 1.5uH. So, there must be a mistake in
>Richard's Guide. It is easy to see that as the length to diameter ratio
>increases, the difference in the above diameters become negligible. But
>with shorter lengths, the difference can obviously be a great  concern.
>
>Take care,
>Bart
>
>
>
>
>
>
>Wow!
>
>Does this mean that everyone who used Richard Hull's  CSN Guide  to interpret
>Tesla's notes for the last 13 years has been wrong by a factor of  10 on
>inductance,and NOBODY noticed??
>
>Matt D.
>
>
>
>************************************** See what's free at http://www.aol.com.
>
>
>
>
>
>
>

```