This afternoon I went out back and cleaned up some fire wood we didn’t burn making syrup this year and ended up putting a scratch coat of cob on the cooker. Leah noted this evening that it’s almost impossible to get anyone to help with things around here if I don’t let anyone else know what I’m thinking of doing, especially myself, until moments before I do it. I didn’t have a clue that I would be mixing cob today. Well, mix it I did. I don’t have any straw right now so I just used a bale of last year’s hay. Not ideal with seeds in it and all. Another experiment. Here’s the thing though. This thing is tiny. More than 2 people would have been standing around watching.
Since I had the chance, I modified the firebox. Leah can work the stove without compulsively stuffing as much wood in the hole as possible (like me), so the tunnel didn’t overfill and plug up with coals when she fired it. This was not my reality. From the eyeballing I’ve been doing of the Haiti stoves that J Anderson has been around, I’ve wondered about shortening the burn tunnel. The fire really just needs to be under the riser, not necessarily pulled back away. I think moving the pile of fire into the stove and allowing the unburned wood to have a spot to sit, away from the fire, will help with efficiency. There’s just that much less to heat up. More over, it will remind me to not jamb so much wood in. I’m not going for cone 10 here or anything.
I tried something different with cobbing onto bricks this time. I noticed that when we cobbed around the rocket stove in the Seedhouse, the cob slumped away from the sides of the brick wall fairly relentlessly. This time I made “bowties” out of some scrap 1/4″ hardware fabric and attached them with masonry screws directly into the brick. This gave us a place to wrap the longer stems of hay. And the cob could squish into the mesh. They are scattered around the upper lip and down the back wall fairly liberally.
The mixture was a bit rough to prepare. The clay is fairly dry so mashing it though the 1/2″ screen is work. 50% clay 50% sand covered with a thick flake of hay and way more water than I expected. I had to break up some of the more stubborn clumps of hay but once everything is wet and mushy, it’s just a dream to put up. Scooping up a full double handful and mashing it around a corner and up to one of the bowties was amazing. Because it was so moist, it stuck to the brick. The long hay snaked into and around the bowties and it all hang in place. Leah worked out the staired firebox. Very referential to burnt offerings and spiraling smoke. There is a bit of shaping to do tomorrow. And I need to set some metal into the top as a rain cap/pot riser. Regardless, the final layers will have lime plaster in them. this will tighten up the surface. Time will tell of course.
as a side note, I’ve cut the holes and manufactured chimneys for the wood kiln. I’m looking for 5 and 13 quart bowls, just the right ones, to be my cooker top. Once I find the bowls, I can fill the kiln. It’s all a complicatedly simple process I’ve been using for years.