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shelf loading on lowest shelf. notice that the original owner did not use a shelf here and placed work on the bottom of the kiln. glaze spashes show in upper corner. shelf rests on pile of grog that was leveled to counteract the sloping floor under the kiln. the shelves now sit level but the floor under the kiln slants noticably toward the wall. it matters in glaze firing that pieces be level as much as possible. pieces are fired on medium grog to allow movement during shrinkage.