SEPARATING BUCKHORX FROM CLOVER AND ALFALFA SEEDS. 
SIEVES OK SCREENS. 
Two screens are required to effect the separation of buckhorn seeds 
and sawdust from alfalfa seeds: an upper one of sheet zinc perfo- 
Fig. 4. — Buckhorn seeds coated with a grade of sawdust too coarse to pass through a Xo. 
22 mesh (a) : similar seeds coated with sawdust passed through a Xo. 22 mesh and 
from which very fine particles have been screened out (6) ; similar seeds coated with 
very fine sawdust (c) : similar seeds coated with white sand (d). (Natural size.) 
rated with round holes of one-fifteenth-inch diameter (fig. 5), and 
a lower one of No. 22 mesh wire cloth. The mixture of seeds and saw- 
dust is fed continuously upon the upper screen. The sawdust and 
free seeds pass through to the lower screen, and the coated buckhorn 
seeds are retained. The sawdust alone will pass through the lower 
screen, leaving the clean al- 
falfa seeds to lie discharged 
by thai screen into any suit- 
able receptacle. Care should 
be taken that too great a quan- 
tity of the mixture is not fed 
upon the upper screen at once. 
in which case some of the less 
heavily coated buckhorn seeds 
may be thrust through, or the 
sawdust may be rubbed off and the buckhorn seeds allowed to escape. 
The separation may be undertaken as soon as a thorough mixture 
of the seeds and sawdust has been effected. The two screens may be 
used together in a light frame such as may be constructed by any 
carpenter or by the farmer himself. They may be used in a seed 
[fire. 2] 
Fig. 5. — Perforated sheet zinc for sieve to 
separate average grade of red clover and 
alfalfa seeds. Holes one-fifteenth inch. 
x.'ii ural size I 
