The labor of August from the Morgan Library’s Hours of Henry VIII MS H.8 fol. 4v shows threshing, the labor that naturally follows after the July calendar image of reaping the wheat. One man with an oxcart and team of oxen has brought a load of wheat to be threshed. It’s been cut and left to dry before being loaded into the wagon. You see him standing next to the oxen with the goad he used to guide them. Inside the barn you see two men with jointed flails beating the dried stalk to loosen the grain from the stems of wheat. A jointed flail consists of a long handle with a short piece of wood attached with a hinged joint at the business end of the flail; this allows the short piece of wood to beat the ears of grain more effectively.
A third man with a rake shifts and turns the stalks so that they are all accessible to the men with flails, and the kernels are not beaten so much that the grain is unusable. The doors of the barn are open for several reasons; light and air, the reduction of dust, and it allows some of the chaff, the inedible straw and broken husks coating individual grains of wheat, to be blown away in a first approximation of winnowing the chaff from the wheat.
You’ll see threshing as the labor of August in the Da Costa Hours as well.