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Date: Wed, 7 Jun 2017 22:47:47 -0700
From: bernard cleyet <bernard@cleyet.org>
To: Phys-L@Phys-L.org
Subject: Re: [Phys-L] e/m apparatus
Message-ID: <87853D54-2BEB-4C9C-9BE1-3FAEA6174F59@cleyet.org>
Content-Type: text/plain; charset=utf-8
On 2017/Jun/07, at 11:45, Peter Schoch <pschoch@fandm.edu> wrote:
Finally I used the 'known' and worked backwards, and the built-in scale
seems to be the culprit. Irksome, to say the least, for that kind of money.
IIRC, ?We? (the students) obtained rather gud results from the Welch fifties system (ca. 1986). (Don?t have reports handy, but do have detailed instructions about error, etc,).
I thought at the time to x-ray the tube using our GE-XRD. I?d get a v. large screen/film from a clinic and have the tube and screen v. far from the diffraction port.
I didn?t ?get around? to calculating how parallel the ?rays? would be. V. large lab. tho.
bc, has complete Busch method from UCB (Coils, 2?BP1, P/Ss), and wonders the % error Peter obtained.
http://aapt.scitation.org/doi/pdf/10.1119/1.1937814
Has anyone calculated the field variation for the Helmholz?
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Message: 4
Date: Thu, 8 Jun 2017 08:48:20 -0500
From: brian whatcott <betwys1@sbcglobal.net>
To: phys-l@mail.phys-l.org
Subject: Re: [Phys-L] e/m apparatus
Message-ID: <f737f3f6-b1ff-1fe0-db1c-defe89ea6bf0@sbcglobal.net>
Content-Type: text/plain; charset=utf-8; format=flowed
Interesting question about Helmholz coils from bc.
The field variation within the coil-enclosed volume is well-known.
In situations where uniformity is important, the coil diameter is large
compared to the experimental volume of interest.
Brian W
On 6/8/2017 12:47 AM, bernard cleyet wrote:
/snip/
bc, has complete Busch method from UCB (Coils, 2?BP1, P/Ss), and wonders the % error Peter obtained.
http://aapt.scitation.org/doi/pdf/10.1119/1.1937814
Has anyone calculated the field variation for the Helmholz?
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End of Phys-l Digest, Vol 150, Issue 2
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