102 Proceedings of the Royal Society of Edinburgh. [Sess. 
A range of crossbred worsted yarns made from a different quality of 
“ top ” (“ top ” is the term applied to the long straight fibres of wool which 
pass subsequently into the worsted thread ; the short curly fibres are combed 
out and rejected as “ noil ”) was selected. 
Table YI. shows the yarn numbers and their respective degrees of twist 
which formed the range. 
TABLE YI. 
Yarn No. 
m. 
24’s. 
32’s. 
40’s. 
Turns per inch 
in singles. 
| 5'6 
8'0 
16'0 
23'0 
Fig. 5 shows the graphical relationship between the yarn numbers as 
abscissae and the turns of twist as ordinates. 
Table VII. shows the percentage “ take-up ” for the “ inverse ” twisting 
of the various members of this range of threads. 
Fig. 6 contains the corresponding graphs connecting percentage “ take- 
up ” as ordinates and yarn number reciprocals as abscissae. 
TABLE VII. 
Percentage Contraction. 
Turns per 
“Inverse” or “crossband” twist. 
inch. 
2/12’s. 
2/24’s. 
2/32’s. 
2/40’s. 
1 
-'09 
-•08 
-TO 
-•25 
2 
0 
-•09 
-13 
-•40 
3 
+ •25 
+ •02 
-•08 
-•43 
4 
•70 
•21 
+ '03 
-•45 
5 
1-25 
*48 
T9 
-•40 
6 
1-91 
•85 
•39 
-•31 
7 
2-70 
1-25 
•59 
-•20 
8 
3-56 
1-69 
•85 
-•04 
9 
4-46 
2*22 
1T3 
+ T2 
10 
5-73 
2-80 
1-42 
•30 
11 
7-01 
3-56 
1-78 
•50 
12 
8*40 
4-45 
2*10 
•72 
13 
535 
2*52 
•95 
14 
6-35 
290 
1-20 
15 
7-36 
335 
1-42 
Reciprocal of 12 = *0833 
„ 24 = '0417 
„ 32 = '0312 
40= 025 
