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Winnowing is a process by which chaff is separated from grain. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation. In its simplest form, it involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery.
Barns may have a granary room or a separate granary building may have been used to store the threshed crop. A unique barn feature in some barns in parts of the northeast United States, called a swing beam , was designed for animals to walk in circles around a pole inside the barn pulling a device to thresh the grain instead of using a flail. [ 7 ]
One of the important qualities of chaff is that it is lightweight, allowing large amounts to be carried. As a result, after release it quickly loses any forward speed it had from the aircraft or rocket launcher, and then begins to fall slowly to the ground. From the viewpoint of an enemy radar, the chaff quickly decays to zero velocity.
A Japanese winnowing basket (2007) A winnowing basket or fan is a tool for winnowing grain from chaff while removing dirt and dust too. [1] They have been used traditionally in a number of civilizations for centuries, [2] and are still in use today in some countries.
Winnowing, used to separate the rice from hulls, is to put the whole rice into a pan and throw it into the air while the wind blows. The light hulls are blown away while the heavy rice fall back into the pan. Later pestles and a simple machine called a rice pounder were developed to remove hulls.
After the grain had been beaten out by the flail or ground out by other means the straw was carefully raked away and the corn and chaff collected to be separated by winnowing when there was a wind blowing. This consisted of tossing the mixture of corn and chaff into the air so that the wind carried away the chaff while the grain fell back on ...
Rabanus Maurus: There is this difference between the chaff and the tares, that the chaff is produced of the same seed as the wheat, but the tares from one of another kind. The chaff therefore are those who enjoy the sacraments of the faith, but are not solid; the tares are those who in profession as well as in works are separated from the lot ...
One form, once common by the Mediterranean Sea, was "about three to four feet wide and six feet deep (these dimensions often vary, however), consisting of two or three wooden planks assembled to one another, of more than four inches wide, in which is several hard and cutting flints crammed into the bottom part pull along over the grains. In the ...