Figure 4. --Clover seed separator. 
The chaff containing the seed 
as taken from the thresher is 
poured through the funnel C^ into 
the air stream in the stovepipe 
D, created by the fan H. With 
properly adjusted velocity of 
air the seed falls through the 
stovepipe into the cleaned-seed 
container J underneath, while 
the chaff is carried by the air 
stream into the box A. In A 
the reduced velocity allows the 
heavier materials to drop while 
the lighter, dusty portion passes 
through the fan H into the cleaner 
bag. With the removable screen 
E^ in place, all material removed 
from the seed except the finest 
chaff may be caught in A, where 
it may be examined. Air velocity 
is controlled by adjustment of 
slide G, which serves as a 
damper to change the size of the inlet opening to the fan. For convenience 
the slide is calibrated arbitrarily according to the diameter of the opening, 
from to 5. The setting of 5 gives the minimum practical operating 
opening of about 10 percent, and at the setting of the inlet is completely 
open. With the slide at position 5 all the fine dusty chaff is carried into 
the bag and few, if any, seeds are rennoved. With the opening at position 
4 most of the coarse and heavy chaff is removed along with some of the 
lighter seeds. The 3 setting, which increases the opening to the fan to 
about 50 percent, removes the remainder of the chaff and practically all 
the light seeds. Further separations may be made at the 2, 1, and 
settings if desired, but these remove more good seed. 
The separator is very efficient in separating the seed and cleaning 
out the refuse. Large pieces of stems are not easily handled, however, 
and they should be removed by screens. Light seeds and stems are 
usually carried out together, and some hand separations may be necessary 
if detailed examinations of these seeds are required. Accumulated dust 
in the bag creates air resistance and reduces the velocity of the air stream 
in the separator. Samples obtained by plucking only the clover heads in 
harvesting are handled moj;e efficiently by the separator, and also by the 
thresher, than are those that include the stenas and leaves also. 
The results obtained when 2 samples of red clover totaling 91 heads 
and containing 80 percent of good seeds were threshed and passed through 
the separator 6 times, once at each slide setting, are given in table 1. 
