Pottery, for artists, craftsmen & teachers by Cox George James 1884-

Author:Cox, George James, 1884-
Language: eng
Format: epub
Tags: Pottery
Publisher: New York, The Macmillan company; [etc., etc.]
Published: 1914-03-25T05:00:00+00:00

TlLf THIMBUS

FIG. 48

on. If the pressure weakens and the flame shortens, the main cock should be turned on. Just above the base of each chimney is a small hole and the flame should show through these towards the finish. If the flame flaps out of the chimney tops, it is so much waste and it should be checked at the taps. The dampers can come right out towards the end, being used to sweat the flame to the front if the back appears to come up too fast.

As white heat approaches, the cones should be observed occasionally. They turn the colour of their surroundings when about to topple over and as the first begins to curl the trial near the spy can be hooked out quickly and tested. When the right cone is well down, the main cock and then the burner taps are turned off. The air regulators are now pulled back and after a few minutes the dampers are closed. The metre is then checked and entered in the firing book.

The kiln should be allowed to cool slowly for at least 12 hours, but the clamming at the top may come away and this will expedite the cooling without risk to the muffle. This time applies to a muffle of about 20" x 15" X 30" dimensions. A smaller kiln will fire up and cool in a shorter time.

Gas kilns as made in America vary in the arrangement of their burners, but the principle is the same. They are simple to manipulate and especially handy

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