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Hi Dale,
50 gauss is not a particularly strong field (100x background earth's field,
but less than 1% of strong field from permanent magnet). But apart from
that, if you want to make sure you have no ferromagnetic impurities, their
physical attraction to a permanent magnet is perhaps not the best way to
isolate them. I think borrowing or making some form of
susceptibility-measuring device is more appropriate.
Best regards,
Peter Boetzkes
----Original Message Follows----
From: "Dale Seppa"
Reply-To: "The Proton Mag Forum"
To: "protonmag @listbot.com"
Subject: Magnet selection help needed.
Date: Tue, 13 Jun 2000 23:17:54 -0600
The Proton Mag Forum
I want a good magnet to use for testing that various parts used for
magnetometer construction have no traces of ferro magnetic contamination.
I have an ad for one from American Science and Surplus which reads as
follows:
... 2 1/2" diameter x 7/8" thick magnet with a 3 1/4" high "T" handle. It
has a whopping 50 gauss @ 3/4" and picked up 20 pounds of solid bar stock in
the R&D lab. The appearance is a little rough - chromed and black steel but
scuffed, but functionally it can't be beat. US$6.50 + shipping and handling
of US$5.50. (Total US$12.00 postpaid)
I want something good and this sounds as strong as any I REMEMBER seeing but
I really do NOT know what "50 Gauss" is and how it compares with other
things available. Any help appreciated.
Best regards to all,
Dale
[email protected]
103 North Sixth Avenue
Virginia, MN 55792 USA
__________________________________________________ ____________________
50 gauss is not a particularly strong field (100x background earth's field,
but less than 1% of strong field from permanent magnet). But apart from
that, if you want to make sure you have no ferromagnetic impurities, their
physical attraction to a permanent magnet is perhaps not the best way to
isolate them. I think borrowing or making some form of
susceptibility-measuring device is more appropriate.
Best regards,
Peter Boetzkes
----Original Message Follows----
From: "Dale Seppa"
Reply-To: "The Proton Mag Forum"
To: "protonmag @listbot.com"
Subject: Magnet selection help needed.
Date: Tue, 13 Jun 2000 23:17:54 -0600
The Proton Mag Forum
I want a good magnet to use for testing that various parts used for
magnetometer construction have no traces of ferro magnetic contamination.
I have an ad for one from American Science and Surplus which reads as
follows:
... 2 1/2" diameter x 7/8" thick magnet with a 3 1/4" high "T" handle. It
has a whopping 50 gauss @ 3/4" and picked up 20 pounds of solid bar stock in
the R&D lab. The appearance is a little rough - chromed and black steel but
scuffed, but functionally it can't be beat. US$6.50 + shipping and handling
of US$5.50. (Total US$12.00 postpaid)
I want something good and this sounds as strong as any I REMEMBER seeing but
I really do NOT know what "50 Gauss" is and how it compares with other
things available. Any help appreciated.
Best regards to all,
Dale
[email protected]
103 North Sixth Avenue
Virginia, MN 55792 USA
__________________________________________________ ____________________