6 
BULLETIN 882, U. S. DEPARTMENT OF AGRICULTURE. 
be so placed that they do not injure the material, or, iii the case of rejected 
fabric, so that the marking does not preclude the use of the material for other 
than Government work. 
25. The inspector shall at all times have free access to all parts of the mills 
which concern the manufacture of fabric ordered to this specification, and shall 
be afforded every facility to satisfy himself that the fabric is in accordance 
with this specification. 
Replacements : 
26. All fabric that does not conform to this specification shall be rejected and 
shall be replaced by the manufacturer at his expense. 
Communications regarding all technical matters pertaining to specifications 
should be addressed to the Specification Section, Signal Corps, U. S. Army, 
Washington, D. C. 
George O. Sqciek. 
Major General, Chief Signal Officer. 
Soecifi cation No. 16,005-A. 
SIGNAL CORPS, UNITED STATES ARMY. 
Specifications for mercerized cotton airplane fabric {grade B). 
December 15, 1917. Supersedes Specification No. 16.005. 
[These specifications are the same as the 2/60 (Spec. No. 16,004-A) except for changes 
in the following numbers: 1, 2, 5, 6, 9, 16. and 17.] 
1. This specification is drawn to cover the requirements of the Signal Corps 
for all purchases of mercerized cotton airplane fabrics, Grade B. 
2. The warp and filling yarns used in the manufacture of this fabric must 
be size 3/80, according to the English cotton-yarn numbers. A tolerance of plus 
or minus four (±4) will be allowed in the size of single yarns. 
5. It is recommended that the single yarn be given 36 to 40 turns per inch 
of twist and that 18 to 20 turns per inch be used for twisting these yarns to- 
gether. This procedure may be altered provided that the fabric conforms to 
this specification in other respects. 
6. There must be at least 68 threads and not more than 72 threads per inch 
in both warp and filling. 
9. The fabric, under normal moisture conditions, must not weigh more 
than four (4) ounces per square yard. 
16. The average breaking load of the five (5) specimens, cut in the direction 
of the warp and the average breaking load of the five (5) specimens cut in the 
direction of the filling, as shown in figure 1, must each be at least 73 pounds. 
17. The elongation shall be observed when the specimens are subjected to 
each of the loads given in Table 1. 
Tension 
pounds. 
Elongation in 
inches. 
Warp. 
Filling. 
10 
20 
65 
0.70 
.86 
1.16 
0. 44 
.52 
.78 
