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bisuqe firing problem

updated thu 12 sep 02

 

Rebecca Knight on wed 11 sep 02


I just unloaded a bisque and the cones did not bend. I'm hoping someone can
help me figure out what's going on. Details below.

It is a new kiln, bought a few months ago, with a controller. I'm using the
slow bisque program.This was the 4th bisque. The first two fired
beautifully, top to bottom. In the third bisque firing, the kiln had three
cone packs, none of which had bent cones. The same thing happened with
this firing. The controller registers a top temp of 1737 F (cone 08). Cone
07 was down in the first two firings. In between each bisque I fired a
glaze load. These get to temp, unevenly, but the cones register as they
should.

The ware is bisqued, I just don't know to what cone.

Any ideas?

Thanks.