They insist on calling them thrashing boxes, but that makes them sound like school classrooms used to be.

I think the thing on the right was probably for collecting cut timber. The smaller thing in front probably carried a seed drill. Typical of the cornucopia of old implements scattered all over the farm

My parents bought a farm in 1953 and must have been about the last to use late season threshing. The wheat (or other cereal) is cut into 'sheaves' using a reaper-binder. These were then hand assembled into 'stooks' to dry a day or two, then collected into a stack. Then in October, the thresher came along and separated the ears from the stalks. All the neighbours combined in each operation and were rewarded with the feast/binge at the end. Recent slightly different stook for Oats in Cornwall: