1906-7.] Normal Take-up in Twisted Threads — Part II. 
97 
TABLE III. 
Percentage Contraction. 
Turns per 
inch. 
X 
“ Direct” 
or “ openband ” twist. 
“ Inverse 
i” or “ crossband” twist. 
2/12’s. 
2/16’s. 
2/24’s. 
2/12’s. 
2/16’s. 
2/24’s. 
1 
•33 
•30 
•24 
-T6 
-T7 
-T5 
2 
•87 
•75 
•58 
-T8 
-•23 
-•24 
3 
1-62 
1*36 
1-03 
-•06 
-T9 
-•25 
4 
2-58 
2T3 
1-58 
+ ’19 
-•04 
-T9 
5 
3*75 
3-05 
2-24 
*59 
+ •21 
-•07 
6 
5T2 
4T3 
3-00 
IT 2 
•55 
+ T2 
7 
6-73 
5*36 
3-86 
1-80 
1-02 
•39 
8 
8*50 
6-75 
4-83 
2-61 
1-58 
•72 
9 
10*50 
8-29 
5-98 
356 
2-27 
1T2 
10 
4-65 
3-02 
1*59 
11 
5-88 
3-90 
2T4 
12 
7-53 
4*88 
2*75 
For the experimental investigation the same apparatus was used as that 
described on p. 197, vol. xxvi., pt. iii. The thread was stretched between 
two clamps. One of these formed the end of the shorter arm of a bell- 
crank lever, the other arm of which carried a weight. This weight could be 
varied so that the thread might be twisted under any tension desired. The 
other clamp B formed the end of a bar which could be rotated by a wheel, 
the turns being indicated on a dial. The bar could be moved in the 
direction of the thread by a special form of rack and pinion, so that the 
longer arm of the bell-crank lever always remained horizontal. The motion 
of the bar could be measured on a scale, while the thread contractions 
were obtained by taking the difference of the readings on the scale. 
Table IY. shows the results of experiments. 
TABLE IV. 
Percentage Contraction. 
Turns per 
inch. 
X 
“ Direct” < 
or “ openband ” twist. 
“ Inverse 
” or “ crossband ” twist. 
2/12’s. 
2/16’s. 
2/24’s. 
2/12’s. 
2/16’s. 
2/24’s. 
1 
•46 
•40 
•30 
— T4 
-•20 
— 'll 
2 
1-02 
•91 
•65 
— T5 
-*22 
-T7 
3 
1-86 
1-59 
1T7 
-•09 
-T9 
— T1 
4 
2*90 
2-41 
1-85 
+ •21 
+ •02 
- -02 
5 
3*92 
3-26 
2-49 
•55 
•30 
+ T2 
6 
5-20 
4-25 
3*29 
1-08 
•62 
•26 
7 
6-63 
5*38 
4T0 
1*76 
1T0 
•53 
8 
8*32 
665 
5*05 
2*55 
1*67 
•85 
9 
3-44 
232 
1-20 
10 
4-55 
3-05 
1-62 
11 
5-88 
3 92 
2-07 
12 
7-30 
4-95 
2-65 
7 
VOL. XXVII. 
