: JBaymore - Viewing Profile

Be careful taking bodies with little devloped glassy phase (becasue of no spar, frit, or neph. sy. content .... yeah...spodumene counts here.....) up to higher temperatures above the 1100 C / 2012 F range........ particularily with longer firing cycles. They are prone to having the non-melted silica on the body converted to the cristabolite form of SiO₂ ..... which has a nasty huge impact on the COE of the body. Can cause dunting issues on kiln cooling...and also cracking in the domestic oven temperature range. The amount of cristobolite developed is linerally related to the time spent above 1100 / 2012.. ..... twice asl long... twice the conversion level.

Some of these above recipes would tend to have that issue, I think. Cone 6 is typically reached above that temperature for most typical rates of climb.

best,

.......................john

Welcome Anne. Glad you found us.

best,

.......................john

Chris Campbell, on 18 May 2013 - 08:26 PM, said:

What she said.

best,

...................john

Shirley,

I too learned to program in my Comp Sci classes in college using punch cards. Pain in the butt submitting them to the system administrator and waiting to see if the coding worked. I remember when we finally got acces to the teletype terminals. Yeeehaw!

The UMass mainframe took up a huge building. And of course us students tried to crash it .


Learned Fortran and COBOL and Basic.

Ah.... those were the days. But yes... you out geezered me.

best,

.....................john

Chris Campbell, on 18 May 2013 - 11:14 AM, said:

I'm a member of the "Geezer Club" also.

I BUILT my first computer from components in a kit. Had a whopping 2 K (yes... KILObytes) of RAM. Programmed mainly using machine language for the Z-80 processor. Yup... cassette storage too.

Back in the "ancient times" (late 70's and early 80's) I was already promoting the use of the newfangled personal computer thingies by potters....... early CM and NCECA Journal articles on it (which called for the establishment of an online "Potters Information Center".... prophetic of both Glazebase and CLAYART), selling glaze calc software I wrote, was chair of the first "Computers in the Studio" panel held at NCECA in Boston in 84, etc.. Old CLAYART listserve member too along with a few others here..... and my compuserve.com email address that I still use attests to being an early adaptor of technology in general (my original compuserve email address was actually just all numbers).

Damn...... we've come a LONG way in a relatively short time, haven't we?

best,

...........................john