56 



Journal of Agricultural Research 



Vol. XIX. No. 3 



Table II. — Elasticity of wool fiber at five different humidities 



991. 

 994. 

 996. 



997- 



Sample No. 



Average. 



Number 

 of fibers. 



100 

 100 

 100 

 100 



At relative humidity of- 



40 per cent. 50 per cent. 60 per cent. 70 per cent. 80 per cent. 



Per cent. 

 27. 80 

 28.64 

 34-32 

 24. 20 



28. 74 



Per cent. 

 29. 08 

 30.92 



38-32 

 25. 28 



30.90 



Per cent. 

 28.48 

 31.08 

 38.28 

 27. 28 



\1. 28 



Per cent. 

 29. 24 



31-32 

 40.36 

 27. 00 



31.98 



Per cent. 

 30.04 

 34. 20 

 37-40 

 26.48 



32.03 



N 



"^ 3/a 

 \ 



\ 



\ 



S'O 



&a 



"^^o ^o &tp ?^c> s-o 



Fig. I. — Graphs showing the effect of humidity upon the breaking strength of wool fiber. 



Table I shows an average increase in the tensile strength of scoured 

 wool as the humidity is raised from 40 to 50 per cent, and a decrease as 

 the humidity is raised from 50 to 80 per cent. In Table II the average 

 percentage of elasticity is shown to increase as the humidity is raised 

 from 40 to 80 per cent. 



A new operator was put upon the work in order to obtain more data 

 under the same conditions and additional data on fibers of a smaller 

 diameter. The diameter of the fibers of sample 991 averaged 0.016 mm., 



