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
John,
Bill is right to query this - a magnet won't attract non-magnetic stainless steel (by definition!). I think there may be varieties of stainless whichARE ferromagnetic but the attraction may not be as strong as ordinary steel.
Regards,
John
--John
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 or pained to prevent rusting. I wonder if you can
electroplate a magnet?
John
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
Dear All,
I was thinking about the effect of high temperature on the magnet. I
know that very high temperatures can destroy the magnetic power, but what
about temperatures around 35 or 40ºC, day after day?
Vanderlei Borsari
23.5 S 46.5 W
-Mensagem original-
De: JOHN DAVIS
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
