112 
Proceedings of the Royal Society of Edinburgh. [Sess, 
TABLE I. 
Percentage Contraction for Worsted Yarns. 
Turns 
per 
incli. 
6’s and 20’s twist. 
12’s and 24’s twist. 
Direct. 
Inverse. 
Direct. 
Inverse. 
6’s. 
20’s. 
6’s. 
20’s. 
12’s. 
24’s. 
12’s. 
24’s. 
1 
•61 
•70 
-T6 
+ •08 
•10 
T4 
-•09 
-•06 
2 
1-39 
1*58 
-•04 
•30 
•32 
•39 
0 
+ •02 
3 
2*35 
2-58 
+ •18 
•62 
•68 
•76 
+ *16 
•20 
4 
3*40 
3*72 
•69 
1T2 
1-20 
1-29 
•40 
•49 
5 
' 4-58 
4-96 
1 21 
1*72 
1-76 
1-84 
•79 
•89 
6 
5-81 
6-37 
1-92 
2-53 
2-36 
2*48 
1-23 
1-35 
7 
7*33 
8T5 
2-87 
3*62 
3-01 
3*16 
1-70 
1-90 
8 
8-91 
10T7 
4T0 
5-22 
3*68 
3-88 
2T8 
2-46 
9 
5-51 
. 7T6 
4-41 
4-64 
2*70 
3*07 
10 
• • • 
7T6 
9-31 
5-16 
5*44 
3*21 
3*68 
11 
8*92 
11*36 
3-83 
4-32 
12 
10-89 
14T2 
4*51 
5-01 
TABLE II. 
Percentage Contraction for Woollen Yarns. 
Turns 
per 
inch. 
16-cut and 28-cut twist. 
7-cut and 10-cut twist. 
Direct. 
Inverse. 
Direct. 
Inverse. 
16 cut. 
28 cut. 
16 cut. 
28 cut. 
7 cut. 
10 cut. 
7 cut. 
10 cut. 
1 
•88 
*92 
-•20 
-*19 
1-61 
1*65 
-T6 
+ •09 
2 
1-98 
2*08 
-•26 
-•24 
3-89 
3-98 
+ •20 
•59 
3 
3-39 
3*50 
-T9 
-*18 
6-50 
6-71 
1T0 
1-42 
4 
4-92 
5*08 
- T2 
-*08 
10T1 
10-50 
2-22 
2*79 
5 
6-76 
7*01 
+ TO 
+ T9 
13-69 
15-51 
3-76 
4-52 
6 
8-46 
8*79 
*48 
•55 
5-59 
6*56 
7 
10*58 
11*22 
*80 
•96 
7-51 
8*75 
8 
12*91 
13*88 
1*35 
1-56 
9 
201 
2-33 
10 
2*76 
3-27 
11 
c . • 
3*66 
4-44 
12 
4*78 
5 64 
The average diameter and turns of twist per inch in each single of 
Tables I. and II. are shown in Table III. ; the former measured with a 
microscope fitted with an eyepiece micrometer, the latter by a yarn 
torsion-meter. The fourth column of Table III. shows the ratios of the 
diameters of singles in each two-ply twist ; &.g. the ratio of the diameters 
of 6’s and 20’s worsted is — — — = 1’89. This column furnishes data to 
•0112 
compare the experimental and analytical results. 
