Mark
III: there is now an arch over the the exit flue, with external
buttresses
Mark
III showing the grates under
the sidestoking ports and the
stepped floor.
Lid
is made from slabs
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The lid system is clearly a difficulty for this type of kiln, as it is for John Neely's train kiln which is similar in design. Of the lids Sandy says The lids are made from thick refractory slabs that I had given to me but any kiln shelf would do. I used to use fibre lids but now just lay a row of insulators on top and then pour very sloppy mortar on top of that. This seems to work better in terms of protecting the slabs from cracking and slowing the cooling down.