drive. You have to be careful because can smash your fingers playing with
them.
Jack
At 02:47 PM 2/1/2005, tony moss wrote:
John Carmichael commented;
Anyway, I've been thinking that for some future project, that it would be
possible to attach the gnomon to the SGS using a magnet.
, February 01, 2005 1:37
PM
Subject: Re: Magnetic Gnomon
Attachment
You learn something new every day! I didn't
know about the different stainless steels, but you are right. A magnet
does not stick to our kitchen sink. But you could use regular steel
that's plated, anodized
in Oregon.
From: John Carmichael [EMAIL PROTECTED]
To: Sundial List sundial@rrz.uni-koeln.de
Subject:Magnetic Gnomon Attachment
Date sent: Tue, 1 Feb 2005 11:30:13 -0700
Send reply to: John Carmichael [EMAIL PROTECTED
with a shiny silver substance, and are extremely hard to pull off of a refridgerator!! :-}
Peter
- Original Message -
From: John Carmichael
To: JOHN DAVIS ; [EMAIL PROTECTED]
Cc: Sundial List
Sent: Tuesday, February 01, 2005 1:37 PM
Subject: Re: Magnetic Gnomon Attachment
You learn something
Hello All:
Two weeks ago, I attached the gnomon to my bay
window stained glass sundial.In the
original prototype, I had used a brass baseplate adhered to the outer
protectiveglass with silicone. But this baseplate was a little ugly
becauseyou could see itbehind thepainted sunnface piece in
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Tuesday, February 01, 2005 11:36 AM
Subject: Re: Magnetic Gnomon Attachment
John, is Stainless Steel magnetic?
- Bill
No, but the magnet is. And a magnet will attract it.
Of course, insead of one piece of steel and one magnet, you could
Carmichael [EMAIL PROTECTED] wrote:
- Original Message - From: <[EMAIL PROTECTED]>To: <[EMAIL PROTECTED]>Sent: Tuesday, February 01, 2005 11:36 AMSubject: Re: Magnetic Gnomon Attachment John, is Stainless Steel magnetic? - BillNo, but the magnet is. And a magnet will attract it.Of co
- Original Message -
From:
JOHN DAVIS
To: John Carmichael ; [EMAIL PROTECTED]
Cc: Sundial List
Sent: Tuesday, February 01, 2005 12:02
PM
Subject: Re: Magnetic Gnomon
Attachment
John,
Bill is right to query this - a magnet won't attract non-magnetic
John Carmichael commented;
Anyway, I've been thinking that for some future project, that it would be
possible to attach the gnomon to the SGS using a magnet.
Perhaps you should consider using the new 'rare earth magnets'. These
are available in a variety of sizes but the tiny discs have
[mailto:[EMAIL PROTECTED]
Enviada em: terça-feira, 1 de fevereiro de 2005 16:03
Para: John Carmichael; [EMAIL PROTECTED]
Cc: Sundial List
Assunto: Re: Magnetic Gnomon Attachment
John,
Bill is right to query this - a magnet won't attract non-magnetic stainless
steel (by definition!). I think
The temperature above which demagnetization occurs is called the Curie
point. This is listed for many materials. For example, it can be as low as
25 deg C for monel (nickel copper alloys) to as high as 1121 C for cobalt.
Nickel-iron alloys are in the range 300-500 C; iron is 770 C.
I think
ferromagnetic and would not provide much attractive force to a magnet;
when they are cold-worked, as in rolled sheet, they are only slightly
ferromagnetic but would still not provide sufficient magnetic attractive
force for this approach to be successful.
Some 400-series stainless steels
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