The machine on the bottom left is the wood burning engine pulling a large belt which is hooked around the knob on the machine in the middle. There is a man with a rake in the middle picture, throwing wheat on the belt which will be taken up to the grain extractor. The picture on the upper right is extracting the grain (which comes out the shoot in the middle) and the grain-less wheat is expelled out the front shoot and lands on the ground in a large pile. This process was explained with only my novice language (which is the best I can do). So if there are any wheat farmers reading this please don't laugh I am a city girl.