s 
BULLETIN 1204, V. S. DEPABTMEITT OF AGRICULTURE. 
controlled by a sliding valve at the bottom and real* side of the 
hopper, while the dust was discharged by a small paddle wheel op- 
Pig. 6. — Diagrammatic sketcb showing details of construction of improved type <>r air- 
suction hopper. Bee texl for details. 
crated by a hand crank through two sprockets and a chain. Clamps 
were provided on the inner side for attachment to the upper and 
lower longerons of the plane. 
