[Elecraft] Maxwell's Equations.

Thu Mar 10 11:41:50 EST 2011

For those who might have an interest, there is a brief paper that summarizes Maxwell's equations and shows the connection between the different notations used: differential form, original form, quaternion form, and so on.

http://www.zpenergy.com/downloads/Orig_maxwell_equations.pdf

On Mar 10, 2011, at 8:34 AM, Tom Azlin N4ZPT wrote:

> Does not offend me Jim!
> 
> Was just puzzled.
> 
> The math is hard having forgotten most of that myself especially as I 
> only barely understood it back in college 40 years ago. The book I am 
> reading, "The Maxwellians," is more a science history book than a book 
> on the equations themselves. Interesting reading about the scientists 
> and how they worked this out.  How some ideas survived and some did not.
> 
> 73, tom n4zpt
> 
> 
> 
> 
> On 3/10/2011 10:56 AM, JAMES ROGERS wrote:
>> I am sure what you say has value Tom. It just seems this one has been
>> going on a while. It did prompt me to go out and look up Maxwells
>> equations just to see what you were all talking about and it is
>> interesting but the math is certainly over my head.  I hope my
>> comments did not offend anyone. If so, I apologize, sincerely.
>> 
>> 73s Jim On Mar 10, 2011, at 9:42 AM, Tom Azlin N4ZPT wrote:
>> 
>>> Sorry you are not enjoying the thread James.
>>> 
>>> Seems like many of the email on this reflector has nothing to do
>>> with the K3. I'm an average user of the K3 (and an in progress K2
>>> builder). Talking about the actual equations and the history of
>>> their development seems to me to be of general interest to many of
>>> the readers of this list given the other responses.
>>> 
>>> 73, tom n4zpt
>>> 
>>> On 3/10/2011 10:06 AM, JAMES ROGERS wrote:
>>>> Enough with the Maxwell Equations.... What in the world does this
>>>> represent to the average K3 user? . On Mar 10, 2011, at 8:21 AM,
>>>> Tom Azlin N4ZPT wrote:
>>>> 
>>>>> Hi Kevin,
>>>>> 
>>>>> What was asserted in "The Maxwellians" was that Maxwell died in
>>>>> the middle of a rewrite. It did sound like there was a
>>>>> controversy on his particle (or little eddies?) form of the
>>>>> equations for a field approach. Perhaps that new version would
>>>>> have dropped  the use of quaternions? Have not studied the
>>>>> equations since college, perhaps will go find the papers after
>>>>> I finish this history book. Thanks for the tip on locating the
>>>>> older forms.
>>>>> 
>>>>> 73, tom n4zpt
>>>>> 
>>>>> On 3/10/2011 1:46 AM, Kevin Rock wrote:
>>>>>> There was a group which disliked his use of quaternions so he
>>>>>> was forced to rewrite the system into other systems.  Most of
>>>>>> the work was carried out by others but for him to publish he
>>>>>> needed peer review so he caved into the larger group.  I am
>>>>>> reading his original work from 1873 and finding it very
>>>>>> enlightening.  Even though I have studied the
>>>>>> Heaviside-Gibb's version of the Maxwell equations many times
>>>>>> the quaternions he used in the original paper were very hard
>>>>>> to find.  Luckily they are proliferating online these days.
>>>>>> Kevin.  KD5ONS
>>>>>> 
>>>>>> 
>>>>>> On Wed, 09 Mar 2011 15:31:18 -0800, David
>>>>>> Cutter<d.cutter at ntlworld.com> wrote:
>>>>>> 
>>>>>>> I don't recall that from his biography, I'll have to read
>>>>>>> it again. Interesting.
>>>>>>> 
>>>>>>> David G3UNA
>>>>>>> 
>>>>>>> 
>>>>>>>> Hi Kevin,
>>>>>>>> 
>>>>>>>> Was not Maxwell that condensed the hard to understand
>>>>>>>> original theory. Was some his disciples, aka "The
>>>>>>>> Maxwellians," that finished the theory in the present
>>>>>>>> form.  FitzGerald, Lodge, and Heavyside plus others.
>>>>>>>> 
>>>>>>>> Am just now reading "The Maxwellians" that has this
>>>>>>>> story.
>>>>>>>> 
>>>>>>>> 73, tom n4zpt
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> On 3/6/2011 5:37 PM, Kevin Rock wrote:
>>>>>>>>> I have always wondered how he condensed the original
>>>>>>>>> twenty equations in twenty unknowns down to just four
>>>>>>>>> of them.  The quaternions he used initially were out a
>>>>>>>>> favor with the physics community of the day so he
>>>>>>>>> needed to get them into vector form.  Heaviside did a
>>>>>>>>> good job but how do you characterize a system with
>>>>>>>>> twenty unknowns in four equations?  What has been lost
>>>>>>>>> in the translation? Kevin.  KD5ONS
>>>>> 
>>>>> ______________________________________________________________
>>>>> Elecraft mailing list Home:
>>>>> http://mailman.qth.net/mailman/listinfo/elecraft Help:
>>>>> http://mailman.qth.net/mmfaq.htm Post:
>>>>> mailto:Elecraft at mailman.qth.net
>>>>> 
>>>>> This list hosted by: http://www.qsl.net Please help support
>>>>> this email list: http://www.qsl.net/donate.html
>>>> 
>>>> JIM ROGERS, W4ATK w4atk at bellsouth.net
>>>> http://web.me.com/jimrogers_w4atk K3/100 P3 K2/10
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>>> ______________________________________________________________
>>> Elecraft mailing list Home:
>>> http://mailman.qth.net/mailman/listinfo/elecraft Help:
>>> http://mailman.qth.net/mmfaq.htm Post:
>>> mailto:Elecraft at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net Please help support this
>>> email list: http://www.qsl.net/donate.html
>> 
>> JIM ROGERS, W4ATK w4atk at bellsouth.net
>> http://web.me.com/jimrogers_w4atk K3/100 P3 K2/10
>> 
>> 
>> 
>> 
>> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html