Here you can see the mouth of the furnace of one of the two smaller kilns built by Sophia McDonald on Flat top Hill.
The pattern of brick laying shows the ends of conventional rectangular fire bricks. The circular furnace was shaped by laying bricks in courses with the fronts touching and the backs spaced as quadrants. Once fine beach sand (mainly from basalt) was poured into the wedge shaped joins the whole course would "lock" dirt from around the site would then be backfilled as the "castle wall" of the furnace out the front grew apace. Because the forces on a working kiln are all outward, the castle wall has a generous back-slope on its three sides.
One might speculate that we will never now know the top-to-bottom condition of this furnace as it is full of dirt and rocks.
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Photo taken in Kakanui, New Zealand
Misplaced? Suggest new location