IMPROVED COTTON AIRPLANE FABRIC. 
45 
Inches 
.70 
.60 
•50 
.no 
• 30 
. 20 
.10 
D0?ED CLOTHS 
> 
^ 
Z - 5 lis. load - 57.3$ dope 
3 = 200 lb. load - 63.2$ dope 
4 = 5 lb. load - 58.0% dope after 
being stressed to 350 lbs. 
being stressed to 350 
iba. y 
in / 
Jaw and afterwards broken 
/2 
f 
/ 
k 
f^ 
/ 
/ 
5 
f 
/ 
"I 
f 
1 
1 
A 
^ 
■^ 
t 
— — 
> 
$> 
1C 
20 
30 
^0 
50 
60 
90 
100 lbs. 
Fig. 22. — Elasticity curves showing the effect of doping under different ten- 
sions. Plain-weave cloth made of 3/80's mercerized yarn spun from American 
Egyptian cotton or grade No. 1 (fancy), If inches in length of staple. 
Twist per inch of single yarn, 35.6. 
Twist per inch of ply yarn, 20.6. 
Construction of cloth, 68 ends by 68 picks. 
Strength of caustic, 64 degrees Twaddle. 
