ginny bivaletz on tue 9 may 00
i was wondering what you do differently when it is
time to go into reduction for your glaze firing. your
method of bisque firing sounds delightful simple and i
will be trying it this week. we are still so nervous
about firing, but each time we seem to relax just a
little. thanks so much for your help. ginny from orcas
island , the land of slugs.
--- iandol wrote:
> ----------------------------Original
> message----------------------------
> ------------------
> Gas Bisque Firing
>
> In reply to Ginny B on Orcas Island, Washington
>
> The quick answer is to cut down gas pressure to a
> minimum. From the start of a
> firing choose the lowest gas setting that will give
> a steady flame when the
> damper is almost closed. The damper setting should
> just keep the draft pulling
> and there should be a negative pressure in the
> chamber. This can be checked at
> the spy hole with a lighted wax taper or long
> Lucifer. The flame will drift into
> the spy as air is drawn in. Then watch the
> pyrometer. Increase the gas flow by
> half a pound pressure each hour if the rate of
> temperature increase slows down
> or stalls. Each time you increase gas flow, check
> the internal pressure with the
> taper at the spy and adjust the damper to just give
> an inward flow. It will pay
> at your next firing to record the pyrometer reading
> every ten or fifteen mins
> and plot this onto a graph.
>
> I did this with my kiln for the first three firings.
> Now I can bisque to cone 08
> in 8 hours and glost to cone 8 flat in 14. The graph
> is almost a straight line.
>
> If you need more info, please contact me.
>
> Ivor Lewis
>
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