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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