operable to the plane containing the axis of adjacent rollers in operation it has been found that the limit is about 5 8 of an inch projecting away from the separation ridge if they are extended closer to the axial plane the cotton tends to follow the roller around the roller rather than being diverted across the edge of the bar 68 onto the subsequent roller obviously the purpose is to cause the seed cotton to divert across the bar and not to follow the original roller around therefore it is found that the bars work better from the top scroll because in such a case is that the gravity tends to transfer the cotton to the subsequent roller more than it does on bottom scroll 74 the bottom scroll 74 being the scroll below the rollers inasmuch as a majority of the trash has been cleaned from the seed cotton before the cotton arrives at the lower tier 32 it is not necessary to have a screen below the rollers i e the scroll 74 below the rollers would not be perforated to form a screen however certain operators may prefer that there be a screen below the lower tier and that this screen have openings sufficiently large that the cotton seed will fall through the opening i e in this case not only would the feeder free the.