These are all the pots you can fit in a 4 cu ft soda test kiln; but
since it's all I have these days, it's better than none at all. I'm still
finishing up the bisque I brought from North Carolina and it's going to
take me a long time to get them all fired since I can only fire when I
have 3 guaranteed, clear, no rain days. And here in Southern Oregon that
pretty well limits me to the summer and early fall.
I finally got this little Olympic to fire evenly, but the
firing was not without problems. I really babied this kiln
throughout, which is why I didn't get anything else done yesterday. I'm
still getting back burning on the pilot burner, but it didn't seem to be problematic with the firing.. It's been that way from
day one, so I'll have to see if I can remove that burner and figure out what's
going on.
The
firing was going great. I was dead even on temperature, top and
bottom, and started the first round of soda spraying when Cone 8 was
around 2-3 o'clock. I did two rounds of spraying, and toward the end of
3rd round, the kiln just uttered a horrible, burping sound and shut
off. The temperature dropped like a rock. It took me a few minutes to
turn it back
on, but by then it had dropped about 200 degrees! OK, a pain in the butt
glitch, but I got
it back on up to temperature. Then I decided to do a final, light
spraying and the darned thing repeated the burping scenario and turned
off again. This time I
just surrendered and closed it down. Cone 9 was down flat with 10
starting
and I know my liner glazes are fine at cone 9.
One of
the good things about these portable, single IFB lined
kilns is that they cool fast - really fast! I checked the kiln around 9am this
morning and it was already down to a hair over 100 degrees. So I
unloaded, taking photos of each layer. After getting this thing to fire
evenly, I was definitely going to get a photo record before I shrouded it in it's bright
blue tarp, and rolled it under the eaves till the next firing,
In the next couple of days I'll get those burners cleaned out and
wire brush the horizontal bar and see if I can find what's causing the
back burning on that pilot burner.I just hope I can get those burners
off. I'll probably need to make a trip to Lowe's for spray to unlock
them, since I don't think I have any on hand.
I'm not sure why those burners shut off other
than perhaps the soda caused some back pressure to blow out the pilot,
but why didn't it do it the first two rounds of spraying which were as
long as the third and twice as long as the fourth???? It is a
puzzlement. I'm just wondering if the regulator is going; but they
usually last more than 3 firings! Next firing I may just depress the red
button with a C or similar clamp before I start spraying, or just get
Jim out there to depress it and be there as an extra set of hands in
case it happens again.
The pots came out well, but not
as reduced as much as I expected, based on how early I started reducing
and reduced till the end. In fact, I was concerned that my oribe
accent on one of the pots might go livery red, and was amazed to see a
bright, beautiful oribe. My blue green celadon liner was reduced
enough to
be pale green but not the deeper richer color it can be with a
stronger reduction. The flashing slip wasn't as rich an orange that I
can get with the addition of a bit of salt to the mix. It looked more
like it would without the soda, but no real problem there.
All in all I'm happy
and very relieved that the pots survived those two shutdowns. Only one of the
small bowls had a tiny piece of kiln wash find it's way in the bottom. I'll need at least a week before I even consider
another soda firing; and it may be longer since I don't think this
lovely, sunny weather is going to last this time of year.
Meantime I need to get to the pottery supply for the few things I
need to batch up my other liner and accents glazes. Other than that, the
rest of today is going to be a day of rest and paperwork and make a
clean chart of the firing that I can follow next time.
There's
not much work to show for the time spent firing such a tiny kiln, but the
win for me was getting this kiln to fire dead even, and of course,
freeing some space on my ware cart in my current, limited, studio space
helps as well.