I.Lewis on sat 22 jan 00
------------------
Subject: urinals and graphite
Roger Bourland gives us great graphic tour of the Old West. So let=92s put =
his
mind at ease.
Graphite is pure Carbon, same as diamonds. Called Black Lead. But has =
nothing to
do with that metallic element. Before Graphite was discovered in =
Czechoslovakia
and Keswick, Cumberland, lead and silver were used as drawing media which =
gave
grey lines. When they started to make graphite pencils the name Black Lead =
was
adopted for the product.
Confusing and misleading. Pencil leads, made with graphite are of course a
ceramic product, a mixture of graphite and clay. The proportions, as far as =
I
understand, control the hardness. A clay graphite mixture can be used to
manufacture crucibles. The graphite confers good refractory properties
Regards to all.
Ivor, inquisitive as ever.
Troy Judd on mon 24 jan 00
------------------
-----
=3EGraphite is pure Carbon, same as diamonds. The graphite confers good
refractory properties
=3ERegards to all.
=3EIvor, inquisitive as ever.
Been a bit since my chemistry days, but as I recall, the other naturally
occurring form of pure Carbon is Coal. It seems to me that for all three
the reaction C + Osub2 =97=3ECOsub2 is exothermic and spontaneous at those
temperatures. I can't see why a slightly different crystalline structure
would make such a difference. Can someone correct me if I'm wrong or better
yet explain why.
Troy Judd
mary simmons on tue 25 jan 00
------------------
Well Troy--
Coal is organic, is not a mineral, and has NO crystal structure --I'd be
real surprised if it was PURE carbon or even pure hydrocarbon. Lots of
vegetable matter contains aluminum, among other things--and as coal is
compressed and heated swamp stuff, I'd hazard to say that coal has lots of
stuff in it.
I have NO idea where this discussion was--I haven't been following it,
having little or no interest in urinals, so forgive me for poking my big
fat geologist nose in here right now......
Mary
=3E
=3EBeen a bit since my chemistry days, but as I recall, the other naturally
=3Eoccurring form of pure Carbon is Coal. It seems to me that for all three
=3Ethe reaction C + Osub2 =97=3ECOsub2 is exothermic and spontaneous at =
those
=3Etemperatures. I can't see why a slightly different crystalline structure
=3Ewould make such a difference. Can someone correct me if I'm wrong or =
better
=3Eyet explain why.
=3E
=3ETroy Judd
=3E
NakedClay@aol.com on wed 26 jan 00
In a message dated 1/25/00, Mary writes:
>
> I have NO idea where this discussion was--I haven't been following it,
> having little or no interest in urinals, so forgive me for poking my big
> fat geologist nose in here right now......
>
> Mary
-------------------------------------
LOL! Mary, I feel the same way--what does graphite have to do with urinals
anyhow? As one who frequently uses this kind of convenience, I've not yet
seen one made of graphite!
Could someone please tell us what this thread is about?
Milton NakedClay@AOL.COM
Tommy Humphries on thu 27 jan 00
The following was posted 1/20/2000 in reply to the" buying old
porcelain/ lovely urinals etc." thread that has been ongoing for a while
----- Original Message ----- ----------------------------Original
message----------------------------
Darndest urinals I ever saw were in a church in western Nebraska where I
gave a speech. To save space, I presume, the urinals were arranged at a 90'
angle to one another, so that, unless one was alone, there was always
someone facing you - at right angles. John Wayne once said that the most
difficult problem of being a celebrity came when the guy standing next to
you at a urinal turned and said: "Say, aren't you John Wayne?" The 90 '
angle would solve that problem. But then who wants to use a urinal looking
at someone? Weirdest ones were at Maddona Inn in San Luis Obispo, Ca. Good
Lord! A whole tourist buss passed through there the one time I visited. But
I ramble.
There was an article in CM this month about using graphite as a surface
agent for ^012 pots. Looks great and easy too. But if one were to make a
bean pot fired with graphite surface, would there be a toxicity problem?
Graphite is, after all, also called "black lead." I used to lick my lead
pencils in grade school all the time. Maybe that's what is wrong.
Best,
Roger
From:
To:
Sent: Wednesday, January 26, 2000 3:41 PM
Subject: Re: Subject: urinals and graphite
> ----------------------------Original message----------------------------
> In a message dated 1/25/00, Mary writes:
>
> >
> > I have NO idea where this discussion was--I haven't been following it,
> > having little or no interest in urinals, so forgive me for poking my
big
> > fat geologist nose in here right now......
> >
> > Mary
> -------------------------------------
> LOL! Mary, I feel the same way--what does graphite have to do with
urinals
> anyhow? As one who frequently uses this kind of convenience, I've not yet
> seen one made of graphite!
>
> Could someone please tell us what this thread is about?
>
> Milton NakedClay@AOL.COM
>
Vince Pitelka on thu 27 jan 00
>LOL! Mary, I feel the same way--what does graphite have to do with urinals
>anyhow? As one who frequently uses this kind of convenience, I've not yet
>seen one made of graphite!
>Could someone please tell us what this thread is about?
Thanks for pointing this out Milton. This is a frequent problem on Clayart.
As a thread evolves, those changing the thread should appropriately modify
the subject line. It is simple to do, and saves lots of confusion.
Frequently, a thread will evolve to a completely different subject while
retaining a former subject heading which is no longer relevant, and that is
just plain sloppy.
Best wishes -
- Vince
Vince Pitelka
Home - vpitelka@DeKalb.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
| |
|
