PSN-L Email List Message

Subject: Re: Digest from 11/11/2006 00:01:37
From: "Geoffrey" gmvoeth@...........
Date: Mon, 13 Nov 2006 16:21:41 -0700


Thanks Chris thats the kind of answer I was hoping for.

Regards;
geoff

----- Original Message ----- 
From: 
To: 
Sent: Monday, November 13, 2006 12:16 PM
Subject: Re: Digest from 11/11/2006 00:01:37


> In a message dated 2006/11/13, gmvoeth@........... writes:
> 
>> WHY ??
>> > In a message dated 2006/11/13, gmvoeth@........... writes:
>> >> Ever thought of possibly using a coin ?
>> >> 
>> > Hi Geoff,
>> >       Copper coins are not pure copper. They are a hard alloy which is 
>> > resistant to  wear - NOT what we want!
> 
> Hi Geoff,
> 
>       Because hard alloys have a much greater electrical resistivity than 
> pure Cu and hence you get a greatly diminished damping force. Try sliding a 
> magnet down an inclined plane of Cu or Al and then try it with brass or Duralumin.
> 
>       Regards,
> 
>       Chris Chapman
>
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