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Aug 22, 2018dissymissylessy rated this title 4 out of 5 stars
"The obstacle theory in its essential elements is not hard to understand. A wind strikes an obstacle, say a rocky promontory on a ridge, shears off it, and so starts to spin and soon goes into full circles behind the promontory. Any fire caught in these circles will throw off sparks and even burning branches which, if the conditions are right, will start spot fires, and these, when the conditions continue to be favorable, will swell into fire swirls, and when you get caught between them and the main fire you will be as lucky as Jansson if you regain consciousness in time to vomit. All this is easy to visualize if you like to walk by moving waters and note what happens in a stream when it strikes a half-submerge rock or small logjam. The stream shears off it, and the good fishing is where the eddies form on the rear flanks of the obstacle and behind it."