isaiah 28:27 For the fitches are not threshed with a threshing instrument, neither is a cart wheel turned about upon the cummin; but the fitches are beaten out with a staff, and the cummin with a rod. - Free Bible Online

      27. The husbandman uses the same discretion in threshing. The dill ("fitches") and cummin, leguminous and tender grains, are beaten out, not as wheat, &c., with the heavy corn-drag ("threshing instrument"), but with "a staff"; heavy instruments would crush and injure the seed.
      cart wheel--two iron wheels armed with iron teeth, like a saw, joined together by a wooden axle. The "corn-drag" was made of three or four wooden cylinders, armed with iron teeth or flint stones fixed underneath, and joined like a sledge. Both instruments cut the straw for fodder as well as separated the corn.
      staff--used also where they had but a small quantity of corn; the flail (Ru 2:17).

JFB.