I want to experiment more with this soon myself. It is very interesting. Not visible from long distances as smoke on a fire is.
another idea Ive seen working myself was a wok, with a metal pole welded to the bottom stuck into the ground. he glued mirrors to rocks and would reflect many little suns back onto the wok. I didnt see his actually working but years later, I did it myself. my setup wasnt as easy to use. I had a pan on top of two piles of masonry blocks. so I had a decent spot to reflect the suns onto. I had about a dozen pieces of a mirror I broke up and glued to some rocks. using the soft dirt below so I could angle them in whatever way I needed. I got the pan just barely warm enough to cook slowly. this was in the dead of winter by the way, and of course more mirrors would increase the effects. although I do have a rather strong sun even in winter here...... but for part of the year, I think this would work for most people. save wood (and time processing the wood)like mentioned above, or hide your site a bit. Plus it is interesting.
