Eva Gallagher on wed 16 apr 08
Hello ,- everyone who has been following the thread on clay heating up - see
reply below from Ron Hutcheon. I think if you contact him it looks like he
could solve this mystery for us, though it sounds like you need to compare
the before and after glaze fired properties.
Eva Gallagher
Deep River Potters Guild
----- Original Message -----
From: "Ron Hutcheon"
To: "Michael Milgram"
Cc:
Sent: Tuesday, April 15, 2008 8:20 PM
Subject: RE: [SPAM]: Re: Re: more iron results and MICROWAVES!
>
> Hi Eva & Mike:
>
> I haven`t seen all that is going on, but the bits you attached here are
> interesting and amusing!
>
> I, too, have a coffee cup which heats on its own - a royal nuisance when
> you grab it accidentally, and then try to nuke your coffee!
> Often I have thought I should measure the properties just to see what was
> going on - but that would have destroyed it - and I had other things to
> measure anyway - for money!!!
>
> If your lads are looking for a physicist who also deals in microwave
> heating, I guess I`m it. If they send me samples, Joe ( my partner) and I
> will attempt to measure the complex dielectric constant, both before and
> after glazing, and see if the numbers explain what is happening - which,
> in
> my experience, they should!
>
> We won`t charge anybody anything, and the data will be public property.
> Your group can circulate it.
>
> If the guys want to see what we do and how we measure things, have them go
> to www.mpn.ca .
>
> If they want to e-mail me or phone and chat - great! hutcheon@magma.ca
>
> Ron Hutcheon phone 613 584 1029
>
> Cheers to all
>
> Ron
>
>
> -----Original Message-----
> From: Michael Milgram [mailto:gmtrcs@magma.ca]
> Sent: April 10, 2008 11:36 PM
> To: Ron Hutcheon
> Cc: galla@magma.ca
> Subject: [SPAM]: Re: Re: more iron results and MICROWAVES!
>
>
> Hi Ron:
>
> Eva sent me this and asked for your address. Since we were discussing
> similar things this afternoon, I'm passing it on myself.
> Contact Eva if the details aren't clear.
>
> Mike
> ----- Original Message -----
> From: "Eva Gallagher"
> To: "Michael Milgram"
> Sent: Thursday, April 10, 2008 6:47 PM
> Subject: Fw: Re: more iron results and MICROWAVES!
>
>
>> Hi Mike - do you have Ron Hutcheon's email - perhaps he can help out on
>> this.
>> Eva
>> ----- Original Message -----
>> From: "Nobody Special"
>> To:
>> Sent: Thursday, April 10, 2008 2:54 PM
>> Subject: Re: more iron results and MICROWAVES!
>>
>>
>>> On Wed, 9 Apr 2008 22:14:26 -0700, Dave Finkelnburg
>>>
>>> wrote:
>>>
>>> ---snip---
>>> To prove your hypothesis you have simply
>>>>to glaze more ware, fire it, and expose the resulting
>>>>ware to microwaves. This should be done BEFORE
>>>>washing the ware or otherwise permitting it to become
>>>>exposed to water which might be absorbed and cause
>>>>heating which could obscure the effect of your glaze.
>>> ---snip---
>>>
>>> Dave...
>>>
>>> Experiment completed. I just nuked my "antenna" mug empty. After 5
>>> seconds
>>> it was warm, and after 10 seconds it was too hot to hold, but could
>>> still
>>> be
>>> briefly touched. This mug has not been used in well over a year, so was
>>> quite dry. I next nuked a control mug made of the same clay body and
>>> fired
>>> to the same temperature and in the same kiln, but with a
>>> non-iron-bearing
>>> glaze (a calcium matte). Even after 20 seconds the mug was not even
>>> discernibly warm.
>>>
>>> I don't know if you are following the other thread on this topic, but
>>> Mr.
>>> Sankey has duplicated this effect with his own iron-bearing glaze test
>>> tiles, curiously, one containing phosphorus as mine does (good
>>> observation,
>>> John H.). We now have hypothesis, testing, and repeatability. Perhaps
>>> one
>>> of the physicists on the list can elevate this to theory.
>>>
>>> The microwave effect could still conceivably be attributed to unknown
>>> factors rather than glaze condition, but I do not believe the effect can
>>> be
>>> discounted henceforth.
>>>
>>> This has been great fun, and an intellectual challenge. Thank you all.
>>> Mr.
>>> Sankey, if you do figure out what is going on from a physics standpoint
>>> please let me know, and credit me in your Nobel Prize acceptance speech!
>>>
>>> All the best.
>>>
>>> ...James
>>>
>>>
> ____________________________________________________________________________
> __
>>> Clayart members may send postings to: clayart@lsv.ceramics.org
>>>
>>> You may look at the archives for the list, post messages, change your
>>> subscription settings or unsubscribe/leave the list here:
>>> http://www.acers.org/cic/clayart/
>>>
>>> Moderator of the list is Mel Jacobson who may be reached at
>>> melpots2@visi.com
>>>
>>>
>>
>>
>>
>
>
>
>
Steve Slatin on thu 17 apr 08
Eva --
Ron Hutcheson's offer is quite generous,
and it's also good of you to bring it to
our attention.
I do not have any iron-glaze pottery
that heats up in the microwave so I
can't help, but if one of the people who
has ware that 'misbehaves' like that
wants to step up and provide Ron H.
with a sample he might be able to
provide us with some insight into this
problem.
It may not resolve this issue entirely,
but it has promise it getting us closer.
(So often in pottery, the large number
of variables snaffles us -- we don't
have a problem with a glaze, someone
else does -- we correspond, we recommend
they use the same clay we do. They
still have a problem. We recommend
a different firing temp. Still no resolution.
We've all seen this happen.)
Steve Slatin --
Inanimate! Gooseberry paws dew claws
inanimate! (overheard in Pittsburgh)
--- On Wed, 4/16/08, Eva Gallagher <galla@MAGMA.CA> wrote:
From: Eva Gallagher <galla@MAGMA.CA>
Subject: MICROWAVE expert replies
To: CLAYART@LSV.CERAMICS.ORG
Date: Wednesday, April 16, 2008, 12:30 PM
Hello ,- everyone who has been following the thread on clay heating up - see
reply below from Ron Hutcheon. I think if you contact him it looks like he
could solve this mystery for us, though it sounds like you need to compare
the before and after glaze fired properties.
Eva Gallagher
Deep River Potters Guild
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