In the Western States such a machine is rarely needed, for wheat is there generally free from other grains.
For instance, throughout New England, generally, where various kinds of grain are raised in close proximity, oats, peas, barley, wheat, etc., frequently become mixed, and a machine called a separator is used, by means of which the several grains may be rapidly obtained free from others.  In the Western States such a machine is rarely needed, for wheat is there generally free from other grains.  In such case the ordinary cleaning apparatus is commonly used ; it consists of a cylindrical sieve of wire cloth fixed in a sloping position, and having internal partitions causing it to resemble an Archimedean screw.