‘i CIRCULAR 920, U. S. DEPT. OF AGRICULTURE 
Fabrics tried for tents included various cottons, glass, and nylon. Coated 
nylon has been the most satisfactory from the standpoint of weight and 
strength, but not until 1949 was a coating on nylon obtained that would 
go through a season without showing some deterioration. Tents obtained 
Ficure 8.—Gas applicator in place for introduction of hydrocyanic acid. 
